feat: add const try_from_str constructor to DnsName type.

.github/workflows/ci.yml

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+name: rustls
+
+permissions:
+  contents: read
+
+on:
+  push:
+  pull_request:
+  merge_group:
+  schedule:
+    - cron: '0 21 * * *'
+
+jobs:
+  build:
+    name: Build + test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # test a bunch of toolchains on ubuntu
+        rust:
+          - stable
+          - beta
+          - nightly
+        os: [ubuntu-latest]
+        # but only stable on macos/windows (slower platforms)
+        include:
+          - os: macos-latest
+            rust: stable
+          - os: windows-latest
+            rust: stable
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Install ${{ matrix.rust }} toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+
+      - name: Install valgrind
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y valgrind
+
+      - name: cargo test (debug; default features)
+        run: cargo test
+        env:
+          RUST_BACKTRACE: 1
+
+      - name: cargo test (debug; all features)
+        run: cargo test --all-features
+        env:
+          RUST_BACKTRACE: 1
+
+      - name: cargo test (debug; no default features; no run)
+        run: cargo test --no-default-features
+        env:
+          RUST_BACKTRACE: 1
+
+  wasm_build:
+    name: Build wasm32
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Install stable toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Add wasm target
+        run: rustup target add wasm32-unknown-unknown
+
+      - name: wasm32 build (debug; default features)
+        run: cargo build --target wasm32-unknown-unknown --lib
+        env:
+          RUST_BACKTRACE: 1
+
+      - name: wasm32 build (debug; all features)
+        run: cargo build --target wasm32-unknown-unknown --lib --all-features
+        env:
+          RUST_BACKTRACE: 1
+
+      - name: wasm32 build (debug; no default features)
+        run: cargo build --target wasm32-unknown-unknown --lib --no-default-features
+        env:
+          RUST_BACKTRACE: 1
+
+  msrv:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Install MSRV toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: "1.60"
+
+      - run: cargo check --lib --all-features
+
+  format:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Install rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - name: Check formatting
+        run: cargo fmt --all -- --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Install rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - run: cargo clippy --all-features -- --deny warnings
+
+  semver:
+    name: Check semver compatibility
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Check semver
+        uses: obi1kenobi/cargo-semver-checks-action@v2
+
+  fuzz:
+    name: Smoke-test fuzzing targets
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Install nightly toolchain
+        uses: dtolnay/rust-toolchain@nightly
+
+      - name: Install cargo fuzz
+        run: cargo install cargo-fuzz
+
+      - name: Smoke-test fuzz targets
+        run: |
+          cargo fuzz build
+          for target in $(cargo fuzz list) ; do
+            cargo fuzz run $target -- -max_total_time=10
+          done
+
+  valgrind:
+    name: Check side-channels on base64 decoder
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Install stable toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install valgrind
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y valgrind
+
+      - name: Build and run test
+        run: |
+          cargo test --all-features --lib
+          exe=$(cargo test --all-features --no-run --message-format json | \
+                jq --slurp --raw-output '.[] | select(.reason == "compiler-artifact") | select(.target.name == "rustls_pki_types") | select(.profile.test) | .executable')
+          valgrind --error-exitcode=99 --exit-on-first-error=yes $exe
+

.gitignore

@@ -0,0 +1,3 @@
+/target
+/Cargo.lock
+/.idea

Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "rustls-pki-types"
+version = "1.10.1"
+edition = "2021"
+rust-version = "1.60"
+license = "MIT OR Apache-2.0"
+description = "Shared types for the rustls PKI ecosystem"
+documentation = "https://docs.rs/rustls-pki-types"
+homepage = "https://github.com/rustls/pki-types"
+repository = "https://github.com/rustls/pki-types"
+categories = ["network-programming", "data-structures", "cryptography"]
+
+[features]
+default = ["alloc"]
+alloc = []
+std = ["alloc"]
+web = ["web-time"]
+
+[target.'cfg(all(target_os = "linux", target_arch = "x86_64"))'.dev-dependencies]
+crabgrind = "=0.1.9" # compatible with valgrind package on GHA ubuntu-latest
+
+[target.'cfg(all(target_family = "wasm", target_os = "unknown"))'.dependencies]
+web-time = { version = "1", optional = true }
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]