commit 638106b9a532703c50af06c3954d16679f056ba1
parent db0f6ea16c551f15d6f3d103f77793648f1a1d3f
Author: Silas Brack <silasbrack@gmail.com>
Date: Fri, 12 Jun 2026 23:01:08 +0200
perf: replace lettre with hand-rolled SMTP client
Lettre pulled 122 transitive deps (TLS, IDNA, ICU, email parsing)
for sending plain text emails to localhost. Replaced with ~50
lines of raw SMTP protocol over TcpStream. Binary 5.0MB -> 4.4MB.
Also removed openssl from flake buildInputs (only needed by lettre).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Diffstat:
4 files changed, 58 insertions(+), 768 deletions(-)
diff --git a/Cargo.lock b/Cargo.lock
@@ -24,12 +24,6 @@ dependencies = [
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@@ -381,39 +322,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -438,12 +352,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -462,9 +370,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "hashbrown",
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-]
-
-[[package]]
-name = "security-framework-sys"
-version = "2.17.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ce2691df843ecc5d231c0b14ece2acc3efb62c0a398c7e1d875f3983ce020e3"
-dependencies = [
- "core-foundation-sys",
- "libc",
-]
-
-[[package]]
-name = "semver"
-version = "1.0.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a7852d02fc848982e0c167ef163aaff9cd91dc640ba85e263cb1ce46fae51cd"
-
-[[package]]
name = "serde"
version = "1.0.228"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1360,7 +907,6 @@ dependencies = [
"axum-extra",
"chrono",
"jsonwebtoken",
- "lettre",
"rand",
"rusqlite",
"serde",
@@ -1404,12 +950,6 @@ dependencies = [
]
[[package]]
-name = "stable_deref_trait"
-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
-
-[[package]]
name = "subtle"
version = "2.6.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1433,30 +973,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0bf256ce5efdfa370213c1dabab5935a12e49f2c58d15e9eac2870d3b4f27263"
[[package]]
-name = "synstructure"
-version = "0.13.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "tempfile"
-version = "3.27.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32497e9a4c7b38532efcdebeef879707aa9f794296a4f0244f6f69e9bc8574bd"
-dependencies = [
- "fastrand",
- "getrandom 0.4.2",
- "once_cell",
- "rustix",
- "windows-sys 0.61.2",
-]
-
-[[package]]
name = "thiserror"
version = "2.0.18"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1508,16 +1024,6 @@ dependencies = [
]
[[package]]
-name = "tinystr"
-version = "0.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8323304221c2a851516f22236c5722a72eaa19749016521d6dff0824447d96d"
-dependencies = [
- "displaydoc",
- "zerovec",
-]
-
-[[package]]
name = "tokio"
version = "1.52.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1646,36 +1152,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
[[package]]
-name = "unicode-xid"
-version = "0.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
-
-[[package]]
name = "untrusted"
version = "0.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
[[package]]
-name = "url"
-version = "2.5.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff67a8a4397373c3ef660812acab3268222035010ab8680ec4215f38ba3d0eed"
-dependencies = [
- "form_urlencoded",
- "idna",
- "percent-encoding",
- "serde",
-]
-
-[[package]]
-name = "utf8_iter"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"
-
-[[package]]
name = "vcpkg"
version = "0.2.15"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1694,24 +1176,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
[[package]]
-name = "wasip2"
-version = "1.0.3+wasi-0.2.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "20064672db26d7cdc89c7798c48a0fdfac8213434a1186e5ef29fd560ae223d6"
-dependencies = [
- "wit-bindgen 0.57.1",
-]
-
-[[package]]
-name = "wasip3"
-version = "0.4.0+wasi-0.3.0-rc-2026-01-06"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5428f8bf88ea5ddc08faddef2ac4a67e390b88186c703ce6dbd955e1c145aca5"
-dependencies = [
- "wit-bindgen 0.51.0",
-]
-
-[[package]]
name = "wasm-bindgen"
version = "0.2.118"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1757,40 +1221,6 @@ dependencies = [
]
[[package]]
-name = "wasm-encoder"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "990065f2fe63003fe337b932cfb5e3b80e0b4d0f5ff650e6985b1048f62c8319"
-dependencies = [
- "leb128fmt",
- "wasmparser",
-]
-
-[[package]]
-name = "wasm-metadata"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb0e353e6a2fbdc176932bbaab493762eb1255a7900fe0fea1a2f96c296cc909"
-dependencies = [
- "anyhow",
- "indexmap",
- "wasm-encoder",
- "wasmparser",
-]
-
-[[package]]
-name = "wasmparser"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
-dependencies = [
- "bitflags",
- "hashbrown 0.15.5",
- "indexmap",
- "semver",
-]
-
-[[package]]
name = "windows-core"
version = "0.62.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1932,129 +1362,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
[[package]]
-name = "wit-bindgen"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7249219f66ced02969388cf2bb044a09756a083d0fab1e566056b04d9fbcaa5"
-dependencies = [
- "wit-bindgen-rust-macro",
-]
-
-[[package]]
-name = "wit-bindgen"
-version = "0.57.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ebf944e87a7c253233ad6766e082e3cd714b5d03812acc24c318f549614536e"
-
-[[package]]
-name = "wit-bindgen-core"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea61de684c3ea68cb082b7a88508a8b27fcc8b797d738bfc99a82facf1d752dc"
-dependencies = [
- "anyhow",
- "heck",
- "wit-parser",
-]
-
-[[package]]
-name = "wit-bindgen-rust"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7c566e0f4b284dd6561c786d9cb0142da491f46a9fbed79ea69cdad5db17f21"
-dependencies = [
- "anyhow",
- "heck",
- "indexmap",
- "prettyplease",
- "syn",
- "wasm-metadata",
- "wit-bindgen-core",
- "wit-component",
-]
-
-[[package]]
-name = "wit-bindgen-rust-macro"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c0f9bfd77e6a48eccf51359e3ae77140a7f50b1e2ebfe62422d8afdaffab17a"
-dependencies = [
- "anyhow",
- "prettyplease",
- "proc-macro2",
- "quote",
- "syn",
- "wit-bindgen-core",
- "wit-bindgen-rust",
-]
-
-[[package]]
-name = "wit-component"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
-dependencies = [
- "anyhow",
- "bitflags",
- "indexmap",
- "log",
- "serde",
- "serde_derive",
- "serde_json",
- "wasm-encoder",
- "wasm-metadata",
- "wasmparser",
- "wit-parser",
-]
-
-[[package]]
-name = "wit-parser"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecc8ac4bc1dc3381b7f59c34f00b67e18f910c2c0f50015669dde7def656a736"
-dependencies = [
- "anyhow",
- "id-arena",
- "indexmap",
- "log",
- "semver",
- "serde",
- "serde_derive",
- "serde_json",
- "unicode-xid",
- "wasmparser",
-]
-
-[[package]]
-name = "writeable"
-version = "0.6.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ffae5123b2d3fc086436f8834ae3ab053a283cfac8fe0a0b8eaae044768a4c4"
-
-[[package]]
-name = "yoke"
-version = "0.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "709fe23a0424b6a435d82152b1bd3fdfb0833487d5fa90d05d42762a9891fef5"
-dependencies = [
- "stable_deref_trait",
- "yoke-derive",
- "zerofrom",
-]
-
-[[package]]
-name = "yoke-derive"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de844c262c8848816172cef550288e7dc6c7b7814b4ee56b3e1553f275f1858e"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "synstructure",
-]
-
-[[package]]
name = "zerocopy"
version = "0.8.48"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2075,60 +1382,6 @@ dependencies = [
]
[[package]]
-name = "zerofrom"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ec05a11813ea801ff6d75110ad09cd0824ddba17dfe17128ea0d5f68e6c5272"
-dependencies = [
- "zerofrom-derive",
-]
-
-[[package]]
-name = "zerofrom-derive"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "11532158c46691caf0f2593ea8358fed6bbf68a0315e80aae9bd41fbade684a1"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "synstructure",
-]
-
-[[package]]
-name = "zerotrie"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f9152d31db0792fa83f70fb2f83148effb5c1f5b8c7686c3459e361d9bc20bf"
-dependencies = [
- "displaydoc",
- "yoke",
- "zerofrom",
-]
-
-[[package]]
-name = "zerovec"
-version = "0.11.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90f911cbc359ab6af17377d242225f4d75119aec87ea711a880987b18cd7b239"
-dependencies = [
- "yoke",
- "zerofrom",
- "zerovec-derive",
-]
-
-[[package]]
-name = "zerovec-derive"
-version = "0.11.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "625dc425cab0dca6dc3c3319506e6593dcb08a9f387ea3b284dbd52a92c40555"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
name = "zmij"
version = "1.0.21"
source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
@@ -16,4 +16,3 @@ rusqlite = "0.31"
argon2 = "0.5"
jsonwebtoken = "9"
rand = "0.8"
-lettre = { version = "0.11", features = ["smtp-transport", "builder"] }
diff --git a/flake.nix b/flake.nix
@@ -45,7 +45,6 @@
strictDeps = true;
buildInputs = with pkgs; [
- openssl
sqlite
] ++ lib.optionals pkgs.stdenv.isDarwin [
pkgs.darwin.apple_sdk.frameworks.Security
@@ -103,7 +102,6 @@
strictDeps = true;
buildInputs = with pkgs; [
- openssl
sqlite
] ++ lib.optionals pkgs.stdenv.isDarwin [
pkgs.darwin.apple_sdk.frameworks.Security
diff --git a/src/handlers/auth.rs b/src/handlers/auth.rs
@@ -34,25 +34,65 @@ fn clear_auth_cookie(jar: CookieJar) -> CookieJar {
}
fn send_verification_email(state: &AppState, email: &str, token: &str) -> Result<(), String> {
- use lettre::{SmtpTransport, Transport, Message};
- use lettre::message::header::ContentType;
+ use std::io::{BufRead, BufReader, Write};
+ use std::net::TcpStream;
let verify_url = format!("{}/verify-email?token={}", state.site_url, token);
- let body = format!("Click to verify your email: {}", verify_url);
- let message = Message::builder()
- .from(state.smtp_from.parse().map_err(|e| format!("Invalid from address: {}", e))?)
- .to(email.parse().map_err(|e| format!("Invalid to address: {}", e))?)
- .subject("Verify your email")
- .header(ContentType::TEXT_PLAIN)
- .body(body)
- .map_err(|e| format!("Failed to build email: {}", e))?;
+ let mut stream = TcpStream::connect(format!("{}:{}", state.smtp_host, state.smtp_port))
+ .map_err(|e| format!("SMTP connect failed: {e}"))?;
+ stream
+ .set_read_timeout(Some(std::time::Duration::from_secs(10)))
+ .ok();
+
+ let mut reader = BufReader::new(stream.try_clone().map_err(|e| format!("Clone failed: {e}"))?);
+
+ fn read_reply(reader: &mut BufReader<TcpStream>, expect: &str) -> Result<(), String> {
+ let mut line = String::new();
+ reader
+ .read_line(&mut line)
+ .map_err(|e| format!("SMTP read failed: {e}"))?;
+ if !line.starts_with(expect) {
+ return Err(format!("SMTP unexpected reply: {}", line.trim()));
+ }
+ Ok(())
+ }
+
+ read_reply(&mut reader, "220")?; // greeting
+
+ write!(stream, "EHLO localhost\r\n").map_err(|e| format!("SMTP write: {e}"))?;
+ // EHLO can return multiple lines; read until we get a non-continuation line
+ loop {
+ let mut line = String::new();
+ reader
+ .read_line(&mut line)
+ .map_err(|e| format!("SMTP read: {e}"))?;
+ if line.starts_with("250 ") {
+ break;
+ }
+ if !line.starts_with("250-") {
+ return Err(format!("SMTP EHLO failed: {}", line.trim()));
+ }
+ }
+
+ write!(stream, "MAIL FROM:<{}>\r\n", state.smtp_from).map_err(|e| format!("SMTP write: {e}"))?;
+ read_reply(&mut reader, "250")?;
+
+ write!(stream, "RCPT TO:<{email}>\r\n").map_err(|e| format!("SMTP write: {e}"))?;
+ read_reply(&mut reader, "250")?;
+
+ write!(stream, "DATA\r\n").map_err(|e| format!("SMTP write: {e}"))?;
+ read_reply(&mut reader, "354")?;
- let mailer = SmtpTransport::builder_dangerous(&state.smtp_host)
- .port(state.smtp_port)
- .build();
+ write!(
+ stream,
+ "From: <{}>\r\nTo: <{}>\r\nSubject: Verify your email\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nClick to verify your email: {}\r\n.\r\n",
+ state.smtp_from, email, verify_url
+ )
+ .map_err(|e| format!("SMTP write: {e}"))?;
+ read_reply(&mut reader, "250")?;
- mailer.send(&message).map_err(|e| format!("Failed to send email: {}", e))?;
+ write!(stream, "QUIT\r\n").map_err(|e| format!("SMTP write: {e}"))?;
Ok(())
}
