From 6796dfad18977d45af6e942ba228e4c1652cca3f Mon Sep 17 00:00:00 2001
From: Luke Granger-Brown <hg@lukegb.com>
Date: Sun, 8 Jan 2023 01:54:38 +0000
Subject: [PATCH] passgen: generate google wallet passes from a Boarding Pass
 Aztec

---
 .hgignore                |    3 +
 rust/passgen/Cargo.lock  | 3018 ++++++++++++++++++++++++++++++++++++++
 rust/passgen/Cargo.toml  |   42 +
 rust/passgen/src/main.rs | 1037 +++++++++++++
 4 files changed, 4100 insertions(+)
 create mode 100644 rust/passgen/Cargo.lock
 create mode 100644 rust/passgen/Cargo.toml
 create mode 100644 rust/passgen/src/main.rs

diff --git a/.hgignore b/.hgignore
index 7d25340095..a86b81104d 100644
--- a/.hgignore
+++ b/.hgignore
@@ -7,6 +7,9 @@ ops/secrets/
 ops/vault/cfg/tf/
 ops/vault/cfg/secrets.nix
 
+rust/passgen/input/
+rust/passgen/target/
+
 web/quotes/theme/static/
 
 syntax: regexp
diff --git a/rust/passgen/Cargo.lock b/rust/passgen/Cargo.lock
new file mode 100644
index 0000000000..484372453b
--- /dev/null
+++ b/rust/passgen/Cargo.lock
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+version = "1.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c394b5bd0c6f669e7275d9c20aa90ae064cb22e75a1cad54e1b34088034b149f"
diff --git a/rust/passgen/Cargo.toml b/rust/passgen/Cargo.toml
new file mode 100644
index 0000000000..633d13b583
--- /dev/null
+++ b/rust/passgen/Cargo.toml
@@ -0,0 +1,42 @@
+[package]
+name = "passgen"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = { version = "1.0.68", features = ["backtrace"] }
+async-trait = "0.1.61"
+chrono = "0.4.23"
+clap = { version = "4.0.32", features = ["cargo", "derive"] }
+google-walletobjects1 = "4.0.4"
+http = "0.2.8"
+hyper = "0.14.23"
+hyper-rustls = { version = "0.23.2", features = ["http2"] }
+jwt-simple = "0.11.2"
+phf = { version = "0.11.1", features = ["macros"] }
+rsa = "0.7.2"
+rxing = "0.2.6"
+serde = "1.0.152"
+serde_json = "1.0.91"
+strum = "0.24.1"
+strum_macros = "0.24.3"
+tokio = { version = "1.24.1", features = ["macros", "full"] }
+tower-service = "0.3.2"
+yup-oauth2 = "8.1.0"
+
+[profile.dev.package.rxing]
+opt-level = 3
+
+[profile.dev.package.image]
+opt-level = 3
+
+[profile.dev.package.png]
+opt-level = 3
+
+[profile.dev.package.adler]
+opt-level = 3
+
+[profile.dev.package.num-bigint-dig]
+opt-level = 3
diff --git a/rust/passgen/src/main.rs b/rust/passgen/src/main.rs
new file mode 100644
index 0000000000..5915432f0f
--- /dev/null
+++ b/rust/passgen/src/main.rs
@@ -0,0 +1,1037 @@
+#![allow(dead_code)]
+
+use std::path::PathBuf;
+
+use anyhow::{anyhow, Result};
+use chrono::naive::NaiveDate;
+use chrono::Datelike;
+use chrono::Local;
+use std::cmp::min;
+
+use clap::{Args, Parser, Subcommand};
+
+use async_trait::async_trait;
+use google_walletobjects1::api::{
+    FlightClass, FlightObject, FlightclasMethods, FlightobjectMethods,
+};
+use google_walletobjects1::oauth2::authenticator::{
+    Authenticator, DefaultHyperClient, HyperClientBuilder,
+};
+use google_walletobjects1::oauth2::{read_service_account_key, ServiceAccountAuthenticator};
+use jwt_simple::algorithms::{RS256KeyPair, RSAKeyPairLike};
+use jwt_simple::claims::JWTClaims;
+use strum::IntoEnumIterator;
+use strum_macros::EnumIter;
+
+use serde::{Deserialize, Serialize};
+
+use phf::phf_map;
+use tokio::try_join;
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None, propagate_version = true, subcommand_required = true, arg_required_else_help = true)]
+struct Cli {
+    #[arg(short, long)]
+    service_account_file: Option<PathBuf>,
+
+    #[arg(short, long, default_value = "3388000000022186420")]
+    issuer_id: String,
+
+    #[command(subcommand)]
+    command: Option<Commands>,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// gets an existing pass
+    GetPass(GetPass),
+
+    /// gets an existing class
+    GetClass(GetClass),
+
+    /// uploads a class/pass pair, creating it if necessary. A Google Wallet Add link is printed.
+    Upload(Upload),
+
+    /// generates a class/pass pair from an image, uploads it, and then prints a Google Wallet Add
+    /// link.
+    UploadScan(UploadScan),
+
+    /// reads the aztec code out of an image
+    Scan {
+        /// Path to the image to read.
+        image: PathBuf,
+    },
+}
+
+#[derive(Args)]
+struct GetClass {
+    #[arg(short, long)]
+    object_type: String,
+
+    #[arg(short, long)]
+    class_id: String,
+}
+
+#[derive(Args)]
+struct GetPass {
+    #[arg(short, long)]
+    object_type: String,
+
+    #[arg(short, long)]
+    pass_id: String,
+}
+
+#[derive(Args)]
+struct Upload {
+    #[arg(short, long)]
+    class_json: PathBuf,
+
+    #[arg(short, long)]
+    pass_json: PathBuf,
+}
+
+#[derive(Args)]
+struct UploadScan {
+    image: PathBuf,
+}
+
+struct AirlineDefinition<'a> {
+    iata_code: &'a str,
+    name: &'a str,
+    boarding_policy: &'a str,
+    seat_class_policy: &'a str,
+
+    boarding_pass_background_colour: &'a str,
+
+    frequent_flyer_program_name: Option<&'a str>,
+
+    logo_url: &'a str,
+    alliance_logo_url: Option<&'a str>,
+    hero_image_logo_url: Option<&'a str>,
+    boarding_privilege_logo_url: Option<&'a str>,
+}
+
+const TSA_PRECHECK_LOGO: &str = "https://p.lukegb.com/raw/MiserablyDirectPiglet.jpg";
+
+static AIRLINE_DATA: phf::Map<&'static str, AirlineDefinition<'static>> = phf_map! {
+    "VS" => AirlineDefinition{
+        iata_code: "VS",
+        name: "Virgin Atlantic",
+        boarding_policy: "GROUP_BASED",
+        seat_class_policy: "CABIN_BASED",
+
+        boarding_pass_background_colour: "#4f145b",
+
+        frequent_flyer_program_name: Some("Flying Club"),
+
+        logo_url: "https://p.lukegb.com/raw/VirtuallyCrispViper.png",
+        alliance_logo_url: None,
+        hero_image_logo_url: Some("https://p.lukegb.com/raw/FormerlyDistinctToad.png"),
+        boarding_privilege_logo_url: Some("https://p.lukegb.com/raw/DefinitelyVerifiedTitmouse.png"),
+    },
+};
+
+fn scan(image_path: &PathBuf) -> Result<String> {
+    let image_path_str = (*image_path).to_str().ok_or(anyhow!("invalid path"))?;
+    rxing::helpers::detect_in_file(image_path_str, Some(rxing::BarcodeFormat::AZTEC))
+        .map_err(|e| {
+            anyhow!(
+                "could not parse Aztec barcode from image {}: {}",
+                image_path_str,
+                e
+            )
+        })
+        .map(|r| r.getText().clone())
+}
+
+struct ServiceAccount {
+    service_account_name: String,
+    authenticator: Authenticator<<DefaultHyperClient as HyperClientBuilder>::Connector>,
+    key_pair: RS256KeyPair,
+}
+
+#[derive(Deserialize)]
+struct ServiceAccountJSON {
+    // We omit a lot of fields we don't care about.
+    /// Service Account email
+    client_email: String,
+
+    /// RSA private key
+    private_key: String,
+}
+
+async fn load_service_account(path: &PathBuf) -> Result<ServiceAccount> {
+    let creds = read_service_account_key(path).await?;
+    let sa = ServiceAccountAuthenticator::builder(creds).build().await?;
+
+    let sa_data = tokio::fs::read(path).await?;
+    let sa_parsed: ServiceAccountJSON = serde_json::from_slice(&sa_data[..])?;
+    let key_pair = RS256KeyPair::from_pem(&sa_parsed.private_key)?;
+
+    Ok(ServiceAccount {
+        service_account_name: sa_parsed.client_email,
+        authenticator: sa,
+        key_pair: key_pair,
+    })
+}
+
+async fn load_thing<'a, T: Deserialize<'a>>(path: &PathBuf) -> Result<T> {
+    let data = tokio::fs::read(path).await?;
+    let mut deser = serde_json::Deserializer::from_reader(data.as_slice());
+    let parsed: T = T::deserialize(&mut deser)?;
+    return Ok(parsed);
+}
+
+#[async_trait]
+trait InsertOrUpdate<T: Clone> {
+    async fn insert_now(&self, value: &T) -> Result<bool>;
+    async fn update_now(&self, value: &T) -> Result<()>;
+}
+
+fn is_already_exists(err: &google_walletobjects1::Error) -> bool {
+    match err {
+        google_walletobjects1::Error::BadRequest(v) => match v.pointer("/error/code") {
+            Some(num) => num == 409,
+            None => false,
+        },
+        _ => false,
+    }
+}
+
+#[async_trait]
+impl<S> InsertOrUpdate<FlightClass> for FlightclasMethods<'_, S>
+where
+    S: tower_service::Service<http::Uri> + Clone + Send + Sync + 'static,
+    S::Response: hyper::client::connect::Connection
+        + tokio::io::AsyncRead
+        + tokio::io::AsyncWrite
+        + Send
+        + Unpin
+        + 'static,
+    S::Future: Send + Unpin + 'static,
+    S::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+{
+    async fn insert_now(&self, value: &FlightClass) -> Result<bool> {
+        self.insert(value.clone())
+            .doit()
+            .await
+            .and(Ok(true))
+            .or_else(|e| {
+                if is_already_exists(&e) {
+                    Ok(false)
+                } else {
+                    Err(anyhow!(e))
+                }
+            })
+    }
+    async fn update_now(&self, value: &FlightClass) -> Result<()> {
+        self.update(
+            value.clone(),
+            &value.id.clone().ok_or(anyhow!("no id on FlightClass"))?,
+        )
+        .doit()
+        .await?;
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl<S> InsertOrUpdate<FlightObject> for FlightobjectMethods<'_, S>
+where
+    S: tower_service::Service<http::Uri> + Clone + Send + Sync + 'static,
+    S::Response: hyper::client::connect::Connection
+        + tokio::io::AsyncRead
+        + tokio::io::AsyncWrite
+        + Send
+        + Unpin
+        + 'static,
+    S::Future: Send + Unpin + 'static,
+    S::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+{
+    async fn insert_now(&self, value: &FlightObject) -> Result<bool> {
+        self.insert(value.clone())
+            .doit()
+            .await
+            .and(Ok(true))
+            .or_else(|e| {
+                if is_already_exists(&e) {
+                    Ok(false)
+                } else {
+                    Err(anyhow!(e))
+                }
+            })
+    }
+    async fn update_now(&self, value: &FlightObject) -> Result<()> {
+        self.update(
+            value.clone(),
+            &value.id.clone().ok_or(anyhow!("no id on FlightObject"))?,
+        )
+        .doit()
+        .await?;
+        Ok(())
+    }
+}
+
+#[derive(Serialize, Deserialize)]
+struct AddToWalletPayloadObject {
+    id: String,
+
+    #[serde(rename = "classId", skip_serializing_if = "Option::is_none")]
+    class_id: Option<String>,
+}
+
+#[derive(Serialize, Deserialize)]
+struct AddToWalletPayload {
+    #[serde(skip_serializing_if = "Vec::is_empty", rename = "flightClasses")]
+    flight_classes: Vec<AddToWalletPayloadObject>,
+
+    #[serde(skip_serializing_if = "Vec::is_empty", rename = "flightObjects")]
+    flight_objects: Vec<AddToWalletPayloadObject>,
+}
+
+#[derive(Serialize, Deserialize)]
+struct AddToWalletClaims {
+    origins: Vec<String>,
+
+    #[serde(rename = "typ")]
+    jwt_type: String,
+
+    payload: AddToWalletPayload,
+}
+
+#[derive(Clone, Copy, Debug, EnumIter)]
+#[repr(u8)]
+enum PassengerStatus {
+    NotCheckedIn = b'0',
+    CheckedIn = b'1',
+    BagsCheckedAndNotCheckedIn = b'2',
+    BagsCheckedAndCheckedIn = b'3',
+    PastSecurity = b'4',
+    PastGate = b'5',
+    Transit = b'6',
+    Standby = b'7',
+    BoardingDataRevalidated = b'8',
+    OriginalBoardingLineUsedWhenTicketIssued = b'9',
+    UpOrDownGradingPending = b'A',
+}
+
+impl PassengerStatus {
+    fn from(c: u8) -> Result<PassengerStatus> {
+        for v in PassengerStatus::iter() {
+            if v as u8 == c {
+                return Ok(v);
+            }
+        }
+        Err(anyhow!(
+            "{} ({}) is not a valid PassengerStatus value",
+            c,
+            c as char
+        ))
+    }
+}
+
+#[derive(Clone, Copy, Debug, EnumIter)]
+#[repr(u8)]
+enum DocumentationVerificationStatus {
+    NotRequired = b'0',
+    Required = b'1',
+    Performed = b'2',
+}
+
+impl DocumentationVerificationStatus {
+    fn from(c: u8) -> Result<DocumentationVerificationStatus> {
+        for v in DocumentationVerificationStatus::iter() {
+            if v as u8 == c {
+                return Ok(v);
+            }
+        }
+        Err(anyhow!(
+            "{} ({}) is not a valid DocumentationVerificationStatus value",
+            c,
+            c as char
+        ))
+    }
+}
+
+#[derive(Clone, Copy, Debug, EnumIter)]
+#[repr(u8)]
+enum PassengerDescription {
+    Adult = b'0',
+    Male = b'1',
+    Female = b'2',
+    Child = b'3',
+    Infant = b'4',
+    NoPassenger = b'5', // cabin baggage
+    AdultWithInfant = b'6',
+    UnaccompaniedMinor = b'7',
+}
+
+impl PassengerDescription {
+    fn from(c: u8) -> Result<PassengerDescription> {
+        for v in PassengerDescription::iter() {
+            if v as u8 == c {
+                return Ok(v);
+            }
+        }
+        Err(anyhow!(
+            "{} ({}) is not a valid PassengerDescription value",
+            c,
+            c as char
+        ))
+    }
+}
+
+#[derive(Clone, Copy, Debug, EnumIter)]
+#[repr(u8)]
+enum CheckInSource {
+    Web = b'W',
+    AirportKiosk = b'K',
+    RemoteKiosk = b'R',
+    MobileDevice = b'M',
+    AirportAgent = b'O',
+    TownAgent = b'T',
+    ThirdPartyVendor = b'V',
+}
+
+impl CheckInSource {
+    fn from(c: u8) -> Result<CheckInSource> {
+        for v in CheckInSource::iter() {
+            if v as u8 == c {
+                return Ok(v);
+            }
+        }
+        Err(anyhow!(
+            "{} ({}) is not a valid CheckInSource value",
+            c,
+            c as char
+        ))
+    }
+}
+
+#[derive(Debug)]
+struct BoardingPass {
+    passenger_name: String,
+    eticket_indicator: char,
+
+    version_number: Option<char>,
+    passenger_description: Option<PassengerDescription>,
+    checkin_source: Option<CheckInSource>,
+    boarding_pass_source: Option<CheckInSource>,
+    date_of_issue: Option<NaiveDate>,
+    document_type: Option<char>,
+    boarding_pass_issuing_airline: Option<String>,
+    baggage_tag_plate_number: Option<String>,
+
+    legs: Vec<BoardingPassLeg>,
+
+    security_data_type: u8,
+    security_data: Vec<u8>,
+}
+
+fn parse_boarding_pass_date(
+    from_boarding_pass_str: &str,
+    nearby_date: &NaiveDate,
+) -> Result<NaiveDate> {
+    // Range is 0 to 9999 (although not really).
+    let from_boarding_pass: u16 = from_boarding_pass_str.parse()?;
+
+    match from_boarding_pass_str.len() {
+        4 => Ok(NaiveDate::from_yo_opt(
+            (nearby_date.year() / 10 * 10) + ((from_boarding_pass / 1000) as i32),
+            (from_boarding_pass % 1000).into(),
+        )
+        .ok_or(anyhow!("could not parse date {}", from_boarding_pass_str))?),
+        3 => {
+            // Find the one that's the fewest days away.
+            let year = nearby_date.year();
+            let day: u32 = (from_boarding_pass % 1000).into();
+            let mut options = vec![
+                NaiveDate::from_yo_opt(year, day),
+                NaiveDate::from_yo_opt(year - 1, day),
+                NaiveDate::from_yo_opt(year + 1, day),
+            ];
+            options.sort_by(|a, b| {
+                days_between(nearby_date, a)
+                    .unwrap_or(9999)
+                    .cmp(&days_between(nearby_date, b).unwrap_or(9999))
+            });
+            Ok(options[0].unwrap())
+        }
+        _ => Err(anyhow!(
+            "boarding pass date {} is wrong length",
+            from_boarding_pass_str
+        )),
+    }
+}
+
+fn days_between(nearby_date: &NaiveDate, maybe_date: &Option<NaiveDate>) -> Option<u64> {
+    if maybe_date.is_none() {
+        return None;
+    }
+    let is_date = maybe_date.as_ref().unwrap();
+    let days_between = (*nearby_date - *is_date).num_days();
+    Some(if days_between < 0 {
+        (-days_between) as u64
+    } else {
+        days_between as u64
+    })
+}
+
+impl BoardingPass {
+    fn parse(data: Vec<u8>, nearby_date: &NaiveDate) -> Result<BoardingPass> {
+        if data[0] != b'M' {
+            return Err(anyhow!(
+                "format code was {} ({}), not M",
+                data[0] as char,
+                data[0]
+            ));
+        }
+        let leg_count = match data[1] {
+            b'1' => Ok(1),
+            b'2' => Ok(2),
+            b'3' => Ok(3),
+            b'4' => Ok(4),
+            _ => Err(anyhow!(
+                "leg count was {} ({}), should be 1 to 4",
+                data[1] as char,
+                data[1]
+            )),
+        }?;
+
+        let passenger_name: String = std::str::from_utf8(&data[2..22])?.trim_end().to_string();
+        let eticket_indicator: char = data[22] as char;
+
+        // First leg mandatory data:
+        let (first_leg, mut p) = BoardingPassLeg::parse_mandatory(&data[23..], nearby_date)?;
+        p += 23;
+
+        // We now have enough to start composing the boardingpass.
+        let mut boarding_pass = BoardingPass {
+            passenger_name,
+            eticket_indicator,
+
+            version_number: None,
+            passenger_description: None,
+            checkin_source: None,
+            boarding_pass_source: None,
+            date_of_issue: None,
+            document_type: None,
+            boarding_pass_issuing_airline: None,
+            baggage_tag_plate_number: None,
+
+            legs: vec![first_leg],
+
+            security_data_type: 0xff,
+            security_data: vec![],
+        };
+
+        // Header + first leg optional data (why, IATA, why)
+        let optional_data_size: usize =
+            usize::from_str_radix(std::str::from_utf8(&data[p..p + 2])?, 16)?;
+        let mut optional_data = &data[p + 2..p + 2 + optional_data_size];
+        p += 2 + optional_data_size;
+        if optional_data.len() >= 1 {
+            if optional_data[0] != b'>' {
+                return Err(anyhow!("expected Beginning of version number ('>') at beginning of conditional fields, got {} ({})", optional_data[0], optional_data[0] as char));
+            }
+            optional_data = &optional_data[1..];
+        }
+        if optional_data.len() >= 1 {
+            boarding_pass.version_number = Some(optional_data[0] as char);
+            optional_data = &optional_data[1..];
+        }
+        if optional_data.len() >= 1 {
+            let optional_data_unique_size: usize =
+                usize::from_str_radix(std::str::from_utf8(&optional_data[0..2])?, 16)?;
+            let mut optional_data_unique = &optional_data[2..optional_data_unique_size + 2];
+            if optional_data_unique.len() >= 1 {
+                boarding_pass.passenger_description = if optional_data_unique[0] == b' ' {
+                    None
+                } else {
+                    Some(PassengerDescription::from(optional_data_unique[0])?)
+                };
+                optional_data_unique = &optional_data_unique[1..];
+            }
+            if optional_data_unique.len() >= 1 {
+                boarding_pass.checkin_source = if optional_data_unique[0] == b' ' {
+                    None
+                } else {
+                    Some(CheckInSource::from(optional_data_unique[0])?)
+                };
+                optional_data_unique = &optional_data_unique[1..];
+            }
+            if optional_data_unique.len() >= 1 {
+                boarding_pass.boarding_pass_source = if optional_data_unique[0] == b' ' {
+                    None
+                } else {
+                    Some(CheckInSource::from(optional_data_unique[0])?)
+                };
+                optional_data_unique = &optional_data_unique[1..];
+            }
+            if optional_data_unique.len() >= 4 {
+                let date_of_issue_str = std::str::from_utf8(&optional_data_unique[0..4])?;
+                boarding_pass.date_of_issue = if date_of_issue_str == "    " {
+                    None
+                } else {
+                    Some(parse_boarding_pass_date(date_of_issue_str, nearby_date)?)
+                };
+                optional_data_unique = &optional_data_unique[4..];
+            }
+            // TODO: the above might fall through if we don't have 4 bytes of data
+            if optional_data_unique.len() >= 1 {
+                boarding_pass.document_type = if optional_data_unique[0] == b' ' {
+                    None
+                } else {
+                    Some(optional_data_unique[0] as char)
+                };
+                optional_data_unique = &optional_data_unique[1..];
+            }
+            if optional_data_unique.len() >= 3 {
+                let issuing_airline_str =
+                    std::str::from_utf8(&optional_data_unique[0..3])?.trim_end();
+                boarding_pass.boarding_pass_issuing_airline = if issuing_airline_str == "" {
+                    None
+                } else {
+                    Some(issuing_airline_str.to_string())
+                };
+                optional_data_unique = &optional_data_unique[3..];
+            }
+            // TODO: the above might fall through if we don't have 3 bytes of data
+            let bag_tags_str_len = min(13, optional_data_unique.len());
+            let bag_tags_str =
+                std::str::from_utf8(&optional_data_unique[0..bag_tags_str_len])?.trim_end();
+            boarding_pass.baggage_tag_plate_number = if bag_tags_str == "" {
+                None
+            } else {
+                Some(bag_tags_str.to_string())
+            };
+            optional_data_unique = &optional_data_unique[bag_tags_str_len..];
+            if optional_data_unique.len() != 0 {
+                return Err(anyhow!(
+                    "trailing unique optional data ({} bytes)",
+                    optional_data_unique.len()
+                ));
+            }
+            optional_data = &optional_data[optional_data_unique_size + 2..];
+        }
+
+        // Now for the repeated optional data for the first leg.
+        boarding_pass.legs[0].add_optional(optional_data)?;
+
+        // Now any additional legs(!)
+        for _legnum in 1..leg_count {
+            let (mut leg, leg_bytes) = BoardingPassLeg::parse_mandatory(&data[p..], nearby_date)?;
+            p += leg_bytes;
+
+            let optional_data_size: usize =
+                usize::from_str_radix(std::str::from_utf8(&data[p..p + 2])?, 16)?;
+            let optional_data = &data[p + 2..p + 2 + optional_data_size];
+            p += 2 + optional_data_size;
+
+            leg.add_optional(optional_data)?;
+            boarding_pass.legs.push(leg);
+        }
+
+        // What's left is the security data.
+        if data[p] != b'^' {
+            return Err(anyhow!(
+                "expected security data beginning indicator (^) but got {} ({})",
+                data[p],
+                data[p] as char
+            ));
+        }
+        boarding_pass.security_data_type = data[p + 1];
+        let security_data_size: usize =
+            usize::from_str_radix(std::str::from_utf8(&data[p + 2..p + 4])?, 16)?;
+        boarding_pass.security_data = data[p + 4..p + 4 + security_data_size].to_vec();
+        if data.len() > p + 4 + security_data_size {
+            return Err(anyhow!(
+                "trailing bytes after security data (expected {} bytes of security data)",
+                security_data_size
+            ));
+        }
+
+        Ok(boarding_pass)
+    }
+}
+
+#[derive(Debug)]
+struct BoardingPassLeg {
+    operating_carrier_pnr: String, // 7, left justified w/ trailing blanks
+    origin_airport: String,        // 3
+    destination_airport: String,   // 3
+    operating_carrier: String,     // 3, left justified w/ trailing blanks
+    flight_number: String,         // 5, NNNN[a] (leading zeros + alpha/blank on last digit)
+    date_of_flight: NaiveDate, // 3, leading zeros (this is the day in the year e.g. 001 = Jan 1st,
+    // 365 == Dec 31st)
+    compartment_code: char,
+    seat_number: String,       // 4, NNNa (leading zeros)
+    check_in_sequence: String, // NNNN[f] (leading zeros + alpha/blank on last digit)
+    passenger_status: PassengerStatus,
+
+    airline_numeric_code: Option<String>,
+    document_serial_number: Option<String>,
+    selectee_indicator: Option<char>,
+    documentation_verification: Option<DocumentationVerificationStatus>,
+    marketing_carrier: Option<String>,
+    frequent_flyer_airline: Option<String>,
+    frequent_flyer_number: Option<String>,
+    id_ad_indicator: Option<char>,
+    free_baggage_allowance: Option<String>,
+    airline_data: Option<Vec<u8>>,
+}
+
+impl BoardingPassLeg {
+    fn parse_mandatory(data: &[u8], nearby_date: &NaiveDate) -> Result<(BoardingPassLeg, usize)> {
+        let operating_carrier_pnr: String =
+            std::str::from_utf8(&data[0..7])?.trim_end().to_string();
+        let origin_airport: String = std::str::from_utf8(&data[7..10])?.to_string();
+        let destination_airport: String = std::str::from_utf8(&data[10..13])?.to_string();
+        let operating_carrier: String = std::str::from_utf8(&data[13..16])?.trim_end().to_string();
+        let flight_number: String = std::str::from_utf8(&data[16..21])?
+            .trim_end()
+            .trim_start_matches('0')
+            .to_string();
+        let date_of_flight_str: &str = std::str::from_utf8(&data[21..24])?;
+        let date_of_flight: NaiveDate = parse_boarding_pass_date(date_of_flight_str, nearby_date)?;
+        let compartment_code: char = data[24] as char;
+        let seat_number: String = std::str::from_utf8(&data[25..29])?
+            .trim_start_matches('0')
+            .to_string();
+        let check_in_sequence: String = std::str::from_utf8(&data[29..34])?
+            .trim_end()
+            .trim_start_matches('0')
+            .to_string();
+        let passenger_status: PassengerStatus = PassengerStatus::from(data[34])?;
+        Ok((
+            BoardingPassLeg {
+                operating_carrier_pnr,
+                origin_airport,
+                destination_airport,
+                operating_carrier,
+                flight_number,
+                date_of_flight,
+                compartment_code,
+                seat_number,
+                check_in_sequence,
+                passenger_status,
+
+                airline_numeric_code: None,
+                document_serial_number: None,
+                selectee_indicator: None,
+                documentation_verification: None,
+                marketing_carrier: None,
+                frequent_flyer_airline: None,
+                frequent_flyer_number: None,
+                id_ad_indicator: None,
+                free_baggage_allowance: None,
+                airline_data: None,
+            },
+            35,
+        ))
+    }
+
+    fn add_optional(&mut self, data: &[u8]) -> Result<()> {
+        let structured_data_size: usize =
+            usize::from_str_radix(std::str::from_utf8(&data[0..2])?, 16)?;
+        let mut structured_data = &data[2..structured_data_size + 2];
+
+        if structured_data.len() >= 3 {
+            let airline_code_str = std::str::from_utf8(&structured_data[0..3])?.trim_end();
+            self.airline_numeric_code = if airline_code_str == "" {
+                None
+            } else {
+                Some(airline_code_str.to_string())
+            };
+            structured_data = &structured_data[3..];
+        }
+        if structured_data.len() >= 10 {
+            let document_serial_number_str =
+                std::str::from_utf8(&structured_data[0..10])?.trim_end();
+            self.document_serial_number = if document_serial_number_str == "" {
+                None
+            } else {
+                Some(document_serial_number_str.to_string())
+            };
+            structured_data = &structured_data[10..];
+        }
+        if structured_data.len() >= 1 {
+            self.selectee_indicator = if structured_data[0] == b' ' {
+                None
+            } else {
+                Some(structured_data[0] as char)
+            };
+            structured_data = &structured_data[1..];
+        }
+        if structured_data.len() >= 1 {
+            self.documentation_verification = if structured_data[0] == b' ' {
+                None
+            } else {
+                Some(DocumentationVerificationStatus::from(structured_data[0])?)
+            };
+            structured_data = &structured_data[1..];
+        }
+        if structured_data.len() >= 3 {
+            let marketing_carrier_str = std::str::from_utf8(&structured_data[0..3])?.trim_end();
+            self.marketing_carrier = if marketing_carrier_str == "" {
+                None
+            } else {
+                Some(marketing_carrier_str.to_string())
+            };
+            structured_data = &structured_data[3..];
+        }
+        if structured_data.len() >= 3 {
+            let frequent_flyer_airline_str =
+                std::str::from_utf8(&structured_data[0..3])?.trim_end();
+            self.frequent_flyer_airline = if frequent_flyer_airline_str == "" {
+                None
+            } else {
+                Some(frequent_flyer_airline_str.to_string())
+            };
+            structured_data = &structured_data[3..];
+        }
+        if structured_data.len() >= 16 {
+            let frequent_flyer_number_str =
+                std::str::from_utf8(&structured_data[0..16])?.trim_end();
+            self.frequent_flyer_number = if frequent_flyer_number_str == "" {
+                None
+            } else {
+                Some(frequent_flyer_number_str.to_string())
+            };
+            structured_data = &structured_data[16..];
+        }
+        if structured_data.len() >= 1 {
+            self.id_ad_indicator = if structured_data[0] == b' ' {
+                None
+            } else {
+                Some(structured_data[0] as char)
+            };
+            structured_data = &structured_data[1..];
+        }
+        if structured_data.len() >= 3 {
+            let free_baggage_allowance_str =
+                std::str::from_utf8(&structured_data[0..3])?.trim_end();
+            self.free_baggage_allowance = if free_baggage_allowance_str == "" {
+                None
+            } else {
+                Some(free_baggage_allowance_str.to_string())
+            };
+            structured_data = &structured_data[3..];
+        }
+        if structured_data.len() != 0 {
+            return Err(anyhow!(
+                "trailing data in structured data section ({} bytes)",
+                structured_data.len()
+            ));
+        }
+
+        let unstructured_data = &data[structured_data_size + 2..];
+        if unstructured_data.len() > 0 {
+            self.airline_data = Some(unstructured_data.to_vec());
+        }
+        Ok(())
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    let command = cli.command.unwrap();
+
+    match &command {
+        Commands::Scan { image } => {
+            println!("{}", scan(&image)?);
+            return Ok(());
+        }
+        _ => {}
+    };
+
+    let service_account_file = cli
+        .service_account_file
+        .ok_or(anyhow!("--service-account-file must be set"))?;
+    let sa = load_service_account(&service_account_file).await?;
+
+    let hub = google_walletobjects1::Walletobjects::new(
+        hyper::Client::builder().build(
+            hyper_rustls::HttpsConnectorBuilder::new()
+                .with_native_roots()
+                .https_or_http()
+                .enable_http1()
+                .enable_http2()
+                .build(),
+        ),
+        sa.authenticator,
+    );
+
+    match &command {
+        Commands::Scan { image: _ } => unreachable!(),
+        Commands::GetClass(get) => {
+            let class_id: String = if get.class_id.contains('.') {
+                get.class_id.clone()
+            } else {
+                format!("{}.{}", cli.issuer_id, get.class_id)
+            };
+
+            let (_, class) = hub.flightclass().get(&class_id).doit().await?;
+            println!("{}", serde_json::to_string(&class)?);
+
+            Ok(())
+        }
+        Commands::GetPass(get) => {
+            let pass_id: String = if get.pass_id.contains('.') {
+                get.pass_id.clone()
+            } else {
+                format!("{}.{}", cli.issuer_id, get.pass_id)
+            };
+
+            let (_, pass) = hub.flightobject().get(&pass_id).doit().await?;
+            println!("{}", serde_json::to_string(&pass)?);
+
+            Ok(())
+        }
+        Commands::Upload(upload) => {
+            let (pass, mut class): (FlightObject, FlightClass) = try_join!(
+                load_thing(&upload.pass_json),
+                load_thing(&upload.class_json)
+            )?;
+
+            // Always reset the class state to "UNDER_REVIEW".
+            class.review_status = Some("UNDER_REVIEW".to_string());
+
+            // Try to create the class first...
+            let created_class: bool = hub.flightclass().insert_now(&class).await?;
+            if !created_class {
+                // Already exists.
+                hub.flightclass().update_now(&class).await?;
+            }
+
+            // Then the pass...
+            let created_pass: bool = hub.flightobject().insert_now(&pass).await?;
+            if !created_pass {
+                // Already exists.
+                hub.flightobject().update_now(&pass).await?;
+            }
+
+            // Now generate the URL.
+            let claims: JWTClaims<AddToWalletClaims> = JWTClaims {
+                issued_at: None,
+                expires_at: None,
+                invalid_before: None,
+                audiences: Some(jwt_simple::claims::Audiences::AsString(
+                    "google".to_string(),
+                )),
+                issuer: Some(sa.service_account_name),
+                jwt_id: None,
+                subject: None,
+                nonce: None,
+                custom: AddToWalletClaims {
+                    jwt_type: "savetowallet".to_string(),
+                    origins: vec!["www.lukegb.com".to_string()],
+                    payload: AddToWalletPayload {
+                        flight_classes: vec![AddToWalletPayloadObject {
+                            id: class.id.clone().unwrap(),
+                            class_id: None,
+                        }],
+                        flight_objects: vec![AddToWalletPayloadObject {
+                            id: pass.id.unwrap(),
+                            class_id: Some(class.id.unwrap()),
+                        }],
+                    },
+                },
+            };
+            let token = sa.key_pair.sign(claims)?;
+
+            println!("https://pay.google.com/gp/v/save/{}", token);
+
+            Ok(())
+        }
+        Commands::UploadScan(upload_scan) => {
+            let scanned = scan(&upload_scan.image)?;
+            let boarding_pass =
+                BoardingPass::parse(scanned.as_bytes().to_vec(), &Local::now().date_naive())?;
+            if boarding_pass.legs.len() > 1 {
+                return Err(anyhow!("multi-leg trips aren't supported yet"));
+            }
+            let leg = &boarding_pass.legs[0];
+            let airline_data = AIRLINE_DATA.get(&leg.operating_carrier).ok_or(anyhow!(
+                "no AIRLINE_DATA has been provided for {} yet",
+                leg.operating_carrier
+            ))?;
+
+            let id_prefix = format!(
+                "{}.{}{}-{}-{}{}",
+                cli.issuer_id,
+                leg.operating_carrier,
+                leg.flight_number,
+                leg.date_of_flight,
+                leg.origin_airport,
+                leg.destination_airport
+            );
+            let class_id = &id_prefix;
+            let pass_id = format!("{}-{}", &id_prefix, leg.check_in_sequence);
+
+            let mut class = FlightClass::default();
+            class.id = Some(class_id.clone());
+            class.issuer_name = Some(airline_data.name.to_string());
+            class.hex_background_color =
+                Some(airline_data.boarding_pass_background_colour.to_string());
+            class.review_status = Some("UNDER_REVIEW".to_string());
+            class.boarding_and_seating_policy =
+                Some(google_walletobjects1::api::BoardingAndSeatingPolicy {
+                    boarding_policy: Some(airline_data.boarding_policy.to_string()),
+                    seat_class_policy: Some(airline_data.seat_class_policy.to_string()),
+                    kind: None,
+                });
+            class.origin = Some(airport(&leg.origin_airport));
+            class.destination = Some(airport(&leg.destination_airport));
+            let mut flight_header = google_walletobjects1::api::FlightHeader::default();
+            let mut flight_header_carrier = google_walletobjects1::api::FlightCarrier::default();
+            flight_header_carrier.airline_alliance_logo =
+                airline_data.alliance_logo_url.map(url_to_image);
+            flight_header_carrier.airline_logo = Some(url_to_image(airline_data.logo_url));
+            flight_header_carrier.airline_name =
+                Some(to_localized_string("en-GB", airline_data.name));
+            flight_header_carrier.carrier_iata_code = Some(leg.operating_carrier.to_string());
+            flight_header.carrier = Some(flight_header_carrier);
+            flight_header.flight_number = Some(leg.flight_number.to_string());
+            class.flight_header = Some(flight_header);
+
+            let mut pass = FlightObject::default();
+            pass.id = Some(pass_id.to_string());
+            pass.class_id = Some(class_id.clone());
+
+            Ok(())
+        }
+    }
+}
+
+fn airport(iata_code: &str) -> google_walletobjects1::api::AirportInfo {
+    let mut info = google_walletobjects1::api::AirportInfo::default();
+    info.airport_iata_code = Some(iata_code.to_string());
+    info
+}
+
+fn to_localized_string(locale: &str, s: &str) -> google_walletobjects1::api::LocalizedString {
+    google_walletobjects1::api::LocalizedString {
+        default_value: Some(google_walletobjects1::api::TranslatedString {
+            kind: None,
+            language: Some(locale.to_string()),
+            value: Some(s.to_string()),
+        }),
+        kind: None,
+        translated_values: None,
+    }
+}
+
+fn url_to_image(url: &str) -> google_walletobjects1::api::Image {
+    google_walletobjects1::api::Image {
+        kind: None,
+        content_description: None,
+        source_uri: Some(google_walletobjects1::api::ImageUri {
+            description: None,
+            localized_description: None,
+            uri: Some(url.to_string()),
+        }),
+    }
+}