infrastructure-adapters-google-gmail

Gmail adapter via OAuth2 — read, send, search, and manage email

What it is for

Gmail adapter via OAuth2 for personal Google accounts.

Provides an async client for the Gmail API v1 using OAuth2 authorization code flow with refresh token persistence.

# Setup

1. Create an OAuth client ID in GCP Console (Web application type) 2. Add http://localhost:8085 as an authorized redirect URI 3. Run the authorize example to get a refresh token:

cargo run -p infrastructure-adapters-google-gmail --example authorize

4. Use the client:

use infrastructure_adapters_google_gmail::GmailClient;
let client = GmailClient::from_files(
"client-secrets.json",
"gmail-token.json",
"http://localhost:8085",
)?;
let messages = client.list_messages(Some("is:unread"), 10, None).await?;

Capabilities

No public items.

How to use it

From `examples/authorize.rs`:

use infrastructure_adapters_google_gmail::{generate_pkce, OAuthConfig};
use std::io::{BufRead, BufReader, Write};
use std::net::TcpListener;

const REDIRECT_URI: &str = "http://localhost:8085";
const SCOPES: &[&str] = &[
    "https://www.googleapis.com/auth/gmail.modify",
    "https://www.googleapis.com/auth/gmail.send",
    "https://www.googleapis.com/auth/gmail.readonly",
];

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let args = CliArgs::parse(std::env::args().skip(1));

    let client_json_path = args
        .client_json

From `examples/test_inbox.rs`:

use infrastructure_adapters_google_gmail::GmailClient;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = GmailClient::from_files(
        "/home/nwheelo/.config/wa-bridge/oauth-client.json",
        "/home/nwheelo/.config/wa-bridge/gmail-token.json",
        "http://localhost:8085",
    )?;

    println!("=== Unread Messages (last 5) ===\n");

    let list = client.list_messages(Some("is:unread"), 5, None).await?;

    match list.messages {
        Some(refs) => {
            for msg_ref in &refs {

Module structure

No public modules: the crate root is its whole surface.

Public surface

No public items.

Re-exports. Exported here, defined elsewhere.

Boundary

Reaches into foundation.

Shares tier infrastructure with 82 other crates: infrastructure-acquire, infrastructure-adapters-google-calendar, infrastructure-adapters-google-places, infrastructure-adapters-google-trends, infrastructure-adapters-shodan, infrastructure-adapters-yelp, infrastructure-agent, infrastructure-ai, … (82 total).

_What this crate deliberately does NOT own is a judgment. No committed registry records one for it, so none is stated here._

Where it sits

Tier flow. Which tiers this crate's own edges cross.

flowchart LR
  n_infrastructure["infrastructure"] --> n_foundation["foundation"]

Dependencies

Runtime, in this workspace.

Runtime, from outside the workspace.

Development, from outside the workspace.

Build. None.

Depended on by. 4 workspace crates.

Signal flow — what reaches this crate, and what it reaches.

flowchart LR
  n_application_google_gmail["application-google-gmail"] -->|uses| SELF
  n_infrastructure_mail_headers["infrastructure-mail-headers"] -->|uses| SELF
  n_tools_mail_manager["tools-mail-manager"] -->|uses| SELF
  n_tools_paced_send["tools-paced-send"] -->|uses| SELF
  SELF["infrastructure-adapters-google-gmail"]
  SELF -->|runtime| n_foundation_audit_log["foundation-audit-log"]
  SELF -->|runtime| n_foundation_mail_message["foundation-mail-message"]
  SELF -->|runtime| n_infrastructure_fetcher["infrastructure-fetcher"]
  classDef self fill:#1f883d,stroke:#1f883d,color:#fff;
  class SELF self;

Feature flags

flowchart LR
  n_default["default"] --> n_secure_egress["secure-egress"]
  n_secure_egress["secure-egress"] --> n_dep_infrastructure_fetcher["dep:infrastructure-fetcher"]

Targets

Error model

No public error type was detected: no public item declares a type named *Error, and no public signature returns one.

Operational characteristics

No unsafe block, unsafe fn, unsafe impl or unsafe trait was found by the parser anywhere in this crate's source.

Configuration

No environment variable is read with a literal name anywhere in this crate. A variable whose key is computed at run time cannot be listed here, and is not claimed to be absent.

Related capabilities

4 workspace crates depend on this one: application-google-gmail, infrastructure-mail-headers, tools-mail-manager, tools-paced-send.

Verification

What the tests establish, by name:

• authorize_url_contains_required_params — src/auth.rs
• authorize_url_pkce_contains_challenge_and_state — src/auth.rs
• debug_does_not_leak_oauth_config_secret — src/auth.rs
• debug_does_not_leak_token_data_secrets — src/auth.rs
• generate_pkce_is_not_deterministic — src/auth.rs
• generate_pkce_produces_rfc_compliant_lengths — src/auth.rs
• parse_client_secrets — src/auth.rs
• pkce_matches_rfc7636_example — src/auth.rs
• random_state_has_enough_entropy_and_is_distinct — src/auth.rs
• reject_invalid_secrets — src/auth.rs
• strict_egress_client_is_constructible — src/auth.rs
• token_data_roundtrip — src/auth.rs
• token_expired_check — src/auth.rs
• fetch_builds_email_from_message — src/capability.rs
• fetch_maps_401_to_authentication_error — src/capability.rs
• gmail_client_implements_both_traits_independently — src/capability.rs
• list_folders_returns_label_ids — src/capability.rs
• list_maps_404_to_not_found — src/capability.rs
• list_maps_message_refs_and_next_cursor — src/capability.rs
• list_with_mailbox_sends_label_query — src/capability.rs
• send_maps_429_with_no_retry_after_header_to_the_default_not_zero — src/capability.rs
• send_maps_429_with_retry_after_header_to_that_value — src/capability.rs
• send_posts_raw_message_and_returns_provider_id — src/capability.rs
• send_rejects_message_with_no_recipients — src/capability.rs
• build_raw_mime_joins_multiple_recipients — src/mime.rs
• build_raw_mime_multipart_alternative_when_both_bodies_present — src/mime.rs
• build_raw_mime_plain_text_only — src/mime.rs
• build_raw_mime_skips_attachment_with_no_downloaded_content — src/mime.rs
• build_raw_mime_wraps_in_multipart_mixed_with_attachment — src/mime.rs
• collect_parts_attachment_wins_over_body_mime_type — src/mime.rs
• _… 19 more_

Documentation coverage

Metrics

pie showData
    title Rust source composition
    "Code" : 1965
    "Blank or comment" : 513

Generation

Rendered by tools-corpus corpus readme from repository evidence alone, renderer schema 2, lexicon current. No model, network service or database was consulted. Regenerate with tools-corpus corpus readme --write; verify with --check.