Add API tokens support (#9)

Make it possible to create token authorized to query predetermined set of routes.

Reviewed-on: #9
Co-authored-by: Pierre HUBERT <pierre.git@communiquons.org>
Co-committed-by: Pierre HUBERT <pierre.git@communiquons.org>

virtweb_backend/examples/api_curl.rs

@@ -0,0 +1,66 @@
+use basic_jwt::JWTPrivateKey;
+use clap::Parser;
+use std::os::unix::prelude::CommandExt;
+use std::process::Command;
+use std::str::FromStr;
+use virtweb_backend::api_tokens::TokenVerb;
+use virtweb_backend::extractors::api_auth_extractor::TokenClaims;
+use virtweb_backend::utils::time_utils::time;
+
+/// cURL wrapper to query Virtweb backend API
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    /// URL of VirtWeb
+    #[arg(short('u'), long, env, default_value = "http://localhost:8000")]
+    virtweb_url: String,
+
+    /// Token ID
+    #[arg(short('i'), long, env)]
+    token_id: String,
+
+    /// Token private key
+    #[arg(short('t'), long, env)]
+    token_key: String,
+
+    /// Request verb
+    #[arg(short('X'), long, default_value = "GET")]
+    verb: String,
+
+    /// Request URI
+    uri: String,
+
+    /// Command line arguments to pass to cURL
+    #[clap(trailing_var_arg = true, allow_hyphen_values = true)]
+    run: Vec<String>,
+}
+
+fn main() {
+    let args = Args::parse();
+
+    let full_url = format!("{}{}", args.virtweb_url, args.uri);
+    log::debug!("Full URL: {full_url}");
+
+    let key = JWTPrivateKey::ES384 {
+        r#priv: args.token_key,
+    };
+    let claims = TokenClaims {
+        sub: args.token_id.to_string(),
+        iat: time() as usize,
+        exp: time() as usize + 50,
+        verb: TokenVerb::from_str(&args.verb).expect("Invalid request verb!"),
+        path: args.uri,
+        nonce: uuid::Uuid::new_v4().to_string(),
+    };
+
+    let jwt = key.sign_jwt(&claims).expect("Failed to sign JWT!");
+
+    Command::new("curl")
+        .args(["-X", &args.verb])
+        .args(["-H", &format!("x-token-id: {}", args.token_id)])
+        .args(["-H", &format!("x-token-content: {jwt}")])
+        .args(args.run)
+        .arg(full_url)
+        .exec();
+    panic!("Failed to run curl!")
+}