lib.rs

// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

#![cfg_attr(doc_cfg, feature(doc_cfg))]

use anyhow::Context;
pub use anyhow::Result;
use cargo_toml::{Dependency, Manifest};
use heck::AsShoutySnakeCase;

use tauri_utils::{
  config::Config,
  resources::{external_binaries, resource_relpath, ResourcePaths},
};

use std::{
  collections::HashMap,
  env::var_os,
  fs::{read_to_string, write},
  path::{Path, PathBuf},
};

#[cfg(feature = "codegen")]
mod codegen;
/// Mobile build functions.
pub mod mobile;
mod static_vcruntime;

#[cfg(feature = "codegen")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "codegen")))]
pub use codegen::context::CodegenContext;

fn copy_file(from: impl AsRef<Path>, to: impl AsRef<Path>) -> Result<()> {
  let from = from.as_ref();
  let to = to.as_ref();
  if !from.exists() {
    return Err(anyhow::anyhow!("{:?} does not exist", from));
  }
  if !from.is_file() {
    return Err(anyhow::anyhow!("{:?} is not a file", from));
  }
  let dest_dir = to.parent().expect("No data in parent");
  std::fs::create_dir_all(dest_dir)?;
  std::fs::copy(from, to)?;
  Ok(())
}

fn copy_binaries(
  binaries: ResourcePaths,
  target_triple: &str,
  path: &Path,
  package_name: Option<&String>,
) -> Result<()> {
  for src in binaries {
    let src = src?;
    println!("cargo:rerun-if-changed={}", src.display());
    let file_name = src
      .file_name()
      .expect("failed to extract external binary filename")
      .to_string_lossy()
      .replace(&format!("-{target_triple}"), "");

    if package_name.map_or(false, |n| n == &file_name) {
      return Err(anyhow::anyhow!(
        "Cannot define a sidecar with the same name as the Cargo package name `{}`. Please change the sidecar name in the filesystem and the Tauri configuration.",
        file_name
      ));
    }

    let dest = path.join(file_name);
    if dest.exists() {
      std::fs::remove_file(&dest).unwrap();
    }
    copy_file(&src, &dest)?;
  }
  Ok(())
}

/// Copies resources to a path.
fn copy_resources(resources: ResourcePaths<'_>, path: &Path) -> Result<()> {
  for src in resources {
    let src = src?;
    println!("cargo:rerun-if-changed={}", src.display());
    let dest = path.join(resource_relpath(&src));
    copy_file(&src, dest)?;
  }
  Ok(())
}

// checks if the given Cargo feature is enabled.
fn has_feature(feature: &str) -> bool {
  // when a feature is enabled, Cargo sets the `CARGO_FEATURE_<name` env var to 1
  // https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts
  std::env::var(format!("CARGO_FEATURE_{}", AsShoutySnakeCase(feature)))
    .map(|x| x == "1")
    .unwrap_or(false)
}

// creates a cfg alias if `has_feature` is true.
// `alias` must be a snake case string.
fn cfg_alias(alias: &str, has_feature: bool) {
  if has_feature {
    println!("cargo:rustc-cfg={alias}");
  }
}

/// Attributes used on Windows.
#[allow(dead_code)]
#[derive(Debug, Default)]
pub struct WindowsAttributes {
  window_icon_path: Option<PathBuf>,
  /// A string containing an [application manifest] to be included with the application on Windows.
  ///
  /// Defaults to:
  /// ```ignore
  #[doc = include_str!("window-app-manifest.xml")]
  /// ```
  ///
  /// [application manifest]: https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests
  app_manifest: Option<String>,
}

impl WindowsAttributes {
  /// Creates the default attribute set.
  pub fn new() -> Self {
    Self::default()
  }

  /// Sets the icon to use on the window. Currently only used on Windows.
  /// It must be in `ico` format. Defaults to `icons/icon.ico`.
  #[must_use]
  pub fn window_icon_path<P: AsRef<Path>>(mut self, window_icon_path: P) -> Self {
    self
      .window_icon_path
      .replace(window_icon_path.as_ref().into());
    self
  }

  /// Sets the Windows app [manifest].
  ///
  /// # Example
  ///
  /// The following manifest will brand the exe as requesting administrator privileges.
  /// Thus, everytime it is executed, a Windows UAC dialog will appear.
  ///
  /// Note that you can move the manifest contents to a separate file and use `include_str!("manifest.xml")`
  /// instead of the inline string.
  ///
  /// ```rust,no_run
  /// let mut windows = tauri_build::WindowsAttributes::new();
  /// windows = windows.app_manifest(r#"
  /// <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
  /// <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
  ///     <security>
  ///         <requestedPrivileges>
  ///             <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
  ///         </requestedPrivileges>
  ///     </security>
  /// </trustInfo>
  /// </assembly>
  /// "#);
  /// tauri_build::try_build(
  ///   tauri_build::Attributes::new().windows_attributes(windows)
  /// ).expect("failed to run build script");
  /// ```
  ///
  /// Defaults to:
  /// ```ignore
  #[doc = include_str!("window-app-manifest.xml")]
  /// [manifest]: https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests
  /// ```
  #[must_use]
  pub fn app_manifest<S: AsRef<str>>(mut self, manifest: S) -> Self {
    self.app_manifest = Some(manifest.as_ref().to_string());
    self
  }
}

/// The attributes used on the build.
#[derive(Debug, Default)]
pub struct Attributes {
  #[allow(dead_code)]
  windows_attributes: WindowsAttributes,
}

impl Attributes {
  /// Creates the default attribute set.
  pub fn new() -> Self {
    Self::default()
  }

  /// Sets the icon to use on the window. Currently only used on Windows.
  #[must_use]
  pub fn windows_attributes(mut self, windows_attributes: WindowsAttributes) -> Self {
    self.windows_attributes = windows_attributes;
    self
  }
}

/// Run all build time helpers for your Tauri Application.
///
/// The current helpers include the following:
/// * Generates a Windows Resource file when targeting Windows.
///
/// # Platforms
///
/// [`build()`] should be called inside of `build.rs` regardless of the platform:
/// * New helpers may target more platforms in the future.
/// * Platform specific code is handled by the helpers automatically.
/// * A build script is required in order to activate some cargo environmental variables that are
///   used when generating code and embedding assets - so [`build()`] may as well be called.
///
/// In short, this is saying don't put the call to [`build()`] behind a `#[cfg(windows)]`.
///
/// # Panics
///
/// If any of the build time helpers fail, they will [`std::panic!`] with the related error message.
/// This is typically desirable when running inside a build script; see [`try_build`] for no panics.
pub fn build() {
  if let Err(error) = try_build(Attributes::default()) {
    let error = format!("{error:#}");
    println!("{error}");
    if error.starts_with("unknown field") {
      print!("found an unknown configuration field. This usually means that you are using a CLI version that is newer than `tauri-build` and is incompatible. ");
      println!(
        "Please try updating the Rust crates by running `cargo update` in the Tauri app folder."
      );
    }
    std::process::exit(1);
  }
}

/// Non-panicking [`build()`].
#[allow(unused_variables)]
pub fn try_build(attributes: Attributes) -> Result<()> {
  use anyhow::anyhow;

  println!("cargo:rerun-if-env-changed=TAURI_CONFIG");
  println!("cargo:rerun-if-changed=tauri.conf.json");
  #[cfg(feature = "config-json5")]
  println!("cargo:rerun-if-changed=tauri.conf.json5");
  #[cfg(feature = "config-toml")]
  println!("cargo:rerun-if-changed=Tauri.toml");

  let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
  let mobile = target_os == "ios" || target_os == "android";
  cfg_alias("desktop", !mobile);
  cfg_alias("mobile", mobile);

  let mut config = serde_json::from_value(tauri_utils::config::parse::read_from(
    std::env::current_dir().unwrap(),
  )?)?;
  if let Ok(env) = std::env::var("TAURI_CONFIG") {
    let merge_config: serde_json::Value = serde_json::from_str(&env)?;
    json_patch::merge(&mut config, &merge_config);
  }
  let config: Config = serde_json::from_value(config)?;

  let s = config.tauri.bundle.identifier.split('.');
  let last = s.clone().count() - 1;
  let mut android_package_prefix = String::new();
  for (i, w) in s.enumerate() {
    if i == 0 || i != last {
      android_package_prefix.push_str(w);
      android_package_prefix.push('_');
    }
  }
  android_package_prefix.pop();
  println!("cargo:rustc-env=TAURI_ANDROID_PACKAGE_PREFIX={android_package_prefix}");

  if let Some(project_dir) = var_os("TAURI_ANDROID_PROJECT_PATH").map(PathBuf::from) {
    let gradle_settings_path = project_dir.join("tauri.settings.gradle");
    let app_build_gradle_path = project_dir.join("app").join("tauri.build.gradle.kts");

    let mut gradle_settings =
      "// THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.\n".to_string();
    let mut app_build_gradle = "// THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
val implementation by configurations
dependencies {"
      .to_string();

    let plugins_json_path = project_dir.join(".tauri").join("plugins.json");
    let mut plugins: HashMap<String, mobile::PluginMetadata> = if plugins_json_path.exists() {
      let s = read_to_string(&plugins_json_path)?;
      println!("cargo:rerun-if-changed={}", plugins_json_path.display());
      serde_json::from_str(&s)?
    } else {
      Default::default()
    };

    plugins.insert(
      "tauri-android".into(),
      mobile::PluginMetadata {
        path: var_os("DEP_TAURI_ANDROID_LIBRARY_PATH").map(PathBuf::from).expect("missing `DEP_TAURI_ANDROID_LIBRARY_PATH` environment variable; did you add `tauri` as a dependency to this crate?"),
      },
    );

    for (plugin_name, plugin) in plugins {
      gradle_settings.push_str(&format!("include ':{plugin_name}'"));
      gradle_settings.push('\n');
      gradle_settings.push_str(&format!(
        "project(':{plugin_name}').projectDir = new File({:?})",
        tauri_utils::display_path(plugin.path)
      ));
      gradle_settings.push('\n');

      app_build_gradle.push('\n');
      app_build_gradle.push_str(&format!(r#"  implementation(project(":{plugin_name}"))"#));
    }
    app_build_gradle.push_str("\n}");

    write(&gradle_settings_path, gradle_settings)
      .context("failed to write tauri.settings.gradle")?;

    write(&app_build_gradle_path, app_build_gradle)
      .context("failed to write tauri.build.gradle.kts")?;
  }

  cfg_alias("dev", !has_feature("custom-protocol"));

  let ws_path = get_workspace_dir()?;
  let mut manifest =
    Manifest::<cargo_toml::Value>::from_slice_with_metadata(&std::fs::read("Cargo.toml")?)?;

  if let Ok(ws_manifest) = Manifest::from_path(ws_path.join("Cargo.toml")) {
    Manifest::complete_from_path_and_workspace(
      &mut manifest,
      Path::new("Cargo.toml"),
      Some((&ws_manifest, ws_path.as_path())),
    )?;
  } else {
    Manifest::complete_from_path(&mut manifest, Path::new("Cargo.toml"))?;
  }

  if let Some(tauri_build) = manifest.build_dependencies.remove("tauri-build") {
    let error_message = check_features(&config, tauri_build, true);

    if !error_message.is_empty() {
      return Err(anyhow!("
      The `tauri-build` dependency features on the `Cargo.toml` file does not match the allowlist defined under `tauri.conf.json`.
      Please run `tauri dev` or `tauri build` or {}.
    ", error_message));
    }
  }

  if let Some(tauri) = manifest.dependencies.remove("tauri") {
    let error_message = check_features(&config, tauri, false);

    if !error_message.is_empty() {
      return Err(anyhow!("
      The `tauri` dependency features on the `Cargo.toml` file does not match the `tauri.conf.json` config.
      Please run `tauri dev` or `tauri build` or {}.
    ", error_message));
    }
  }

  let target_triple = std::env::var("TARGET").unwrap();

  println!("cargo:rustc-env=TAURI_TARGET_TRIPLE={target_triple}");

  let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
  // TODO: far from ideal, but there's no other way to get the target dir, see <https://github.com/rust-lang/cargo/issues/5457>
  let target_dir = out_dir
    .parent()
    .unwrap()
    .parent()
    .unwrap()
    .parent()
    .unwrap();

  if let Some(paths) = &config.tauri.bundle.external_bin {
    copy_binaries(
      ResourcePaths::new(external_binaries(paths, &target_triple).as_slice(), true),
      &target_triple,
      target_dir,
      manifest.package.as_ref().map(|p| &p.name),
    )?;
  }

  #[allow(unused_mut, clippy::redundant_clone)]
  let mut resources = config.tauri.bundle.resources.clone().unwrap_or_default();
  if target_triple.contains("windows") {
    if let Some(fixed_webview2_runtime_path) =
      &config.tauri.bundle.windows.webview_fixed_runtime_path
    {
      resources.push(fixed_webview2_runtime_path.display().to_string());
    }
  }
  copy_resources(ResourcePaths::new(resources.as_slice(), true), target_dir)?;

  if target_triple.contains("darwin") {
    if let Some(version) = &config.tauri.bundle.macos.minimum_system_version {
      println!("cargo:rustc-env=MACOSX_DEPLOYMENT_TARGET={version}");
    }
  }

  if target_triple.contains("windows") {
    use semver::Version;
    use tauri_winres::{VersionInfo, WindowsResource};

    fn find_icon<F: Fn(&&String) -> bool>(config: &Config, predicate: F, default: &str) -> PathBuf {
      let icon_path = config
        .tauri
        .bundle
        .icon
        .iter()
        .find(|i| predicate(i))
        .cloned()
        .unwrap_or_else(|| default.to_string());
      icon_path.into()
    }

    let window_icon_path = attributes
      .windows_attributes
      .window_icon_path
      .unwrap_or_else(|| find_icon(&config, |i| i.ends_with(".ico"), "icons/icon.ico"));

    if target_triple.contains("windows") {
      if window_icon_path.exists() {
        let mut res = WindowsResource::new();

        if let Some(manifest) = attributes.windows_attributes.app_manifest {
          res.set_manifest(&manifest);
        } else {
          res.set_manifest(include_str!("window-app-manifest.xml"));
        }

        if let Some(version) = &config.package.version {
          if let Ok(v) = Version::parse(version) {
            let version = v.major << 48 | v.minor << 32 | v.patch << 16;
            res.set_version_info(VersionInfo::FILEVERSION, version);
            res.set_version_info(VersionInfo::PRODUCTVERSION, version);
          }
          res.set("FileVersion", version);
          res.set("ProductVersion", version);
        }
        if let Some(product_name) = &config.package.product_name {
          res.set("ProductName", product_name);
          res.set("FileDescription", product_name);
        }
        res.set_icon_with_id(&window_icon_path.display().to_string(), "32512");
        res.compile().with_context(|| {
          format!(
            "failed to compile `{}` into a Windows Resource file during tauri-build",
            window_icon_path.display()
          )
        })?;
      } else {
        return Err(anyhow!(format!(
          "`{}` not found; required for generating a Windows Resource file during tauri-build",
          window_icon_path.display()
        )));
      }
    }

    let target_env = std::env::var("CARGO_CFG_TARGET_ENV").unwrap();
    match target_env.as_str() {
      "gnu" => {
        let target_arch = match std::env::var("CARGO_CFG_TARGET_ARCH").unwrap().as_str() {
          "x86_64" => Some("x64"),
          "x86" => Some("x86"),
          "aarch64" => Some("arm64"),
          arch => None,
        };
        if let Some(target_arch) = target_arch {
          for entry in std::fs::read_dir(target_dir.join("build"))? {
            let path = entry?.path();
            let webview2_loader_path = path
              .join("out")
              .join(target_arch)
              .join("WebView2Loader.dll");
            if path.to_string_lossy().contains("webview2-com-sys") && webview2_loader_path.exists()
            {
              std::fs::copy(webview2_loader_path, target_dir.join("WebView2Loader.dll"))?;
              break;
            }
          }
        }
      }
      "msvc" => {
        if std::env::var("STATIC_VCRUNTIME").map_or(false, |v| v == "true") {
          static_vcruntime::build();
        }
      }
      _ => (),
    }
  }

  Ok(())
}

#[derive(Debug, Default, PartialEq, Eq)]
struct Diff {
  remove: Vec<String>,
  add: Vec<String>,
}

fn features_diff(current: &[String], expected: &[String]) -> Diff {
  let mut remove = Vec::new();
  let mut add = Vec::new();
  for feature in current {
    if !expected.contains(feature) {
      remove.push(feature.clone());
    }
  }

  for feature in expected {
    if !current.contains(feature) {
      add.push(feature.clone());
    }
  }

  Diff { remove, add }
}

fn check_features(config: &Config, dependency: Dependency, is_tauri_build: bool) -> String {
  use tauri_utils::config::{PatternKind, TauriConfig};

  let features = match dependency {
    Dependency::Simple(_) => Vec::new(),
    Dependency::Detailed(dep) => dep.features,
    Dependency::Inherited(dep) => dep.features,
  };

  let all_cli_managed_features = if is_tauri_build {
    vec!["isolation"]
  } else {
    TauriConfig::all_features()
  };

  let expected = if is_tauri_build {
    match config.tauri.pattern {
      PatternKind::Isolation { .. } => vec!["isolation".to_string()],
      _ => vec![],
    }
  } else {
    config
      .tauri
      .features()
      .into_iter()
      .map(|f| f.to_string())
      .collect::<Vec<String>>()
  };

  let diff = features_diff(
    &features
      .into_iter()
      .filter(|f| all_cli_managed_features.contains(&f.as_str()))
      .collect::<Vec<String>>(),
    &expected,
  );

  let mut error_message = String::new();
  if !diff.remove.is_empty() {
    error_message.push_str("remove the `");
    error_message.push_str(&diff.remove.join(", "));
    error_message.push_str(if diff.remove.len() == 1 {
      "` feature"
    } else {
      "` features"
    });
    if !diff.add.is_empty() {
      error_message.push_str(" and ");
    }
  }
  if !diff.add.is_empty() {
    error_message.push_str("add the `");
    error_message.push_str(&diff.add.join(", "));
    error_message.push_str(if diff.add.len() == 1 {
      "` feature"
    } else {
      "` features"
    });
  }

  error_message
}

#[derive(serde::Deserialize)]
struct CargoMetadata {
  workspace_root: PathBuf,
}

fn get_workspace_dir() -> Result<PathBuf> {
  let output = std::process::Command::new("cargo")
    .args(["metadata", "--no-deps", "--format-version", "1"])
    .output()?;

  if !output.status.success() {
    return Err(anyhow::anyhow!(
      "cargo metadata command exited with a non zero exit code: {}",
      String::from_utf8(output.stderr)?
    ));
  }

  Ok(serde_json::from_slice::<CargoMetadata>(&output.stdout)?.workspace_root)
}

#[cfg(test)]
mod tests {
  use super::Diff;

  #[test]
  fn array_diff() {
    for (current, expected, result) in [
      (vec![], vec![], Default::default()),
      (
        vec!["a".into()],
        vec![],
        Diff {
          remove: vec!["a".into()],
          add: vec![],
        },
      ),
      (vec!["a".into()], vec!["a".into()], Default::default()),
      (
        vec!["a".into(), "b".into()],
        vec!["a".into()],
        Diff {
          remove: vec!["b".into()],
          add: vec![],
        },
      ),
      (
        vec!["a".into(), "b".into()],
        vec!["a".into(), "c".into()],
        Diff {
          remove: vec!["b".into()],
          add: vec!["c".into()],
        },
      ),
    ] {
      assert_eq!(super::features_diff(&current, &expected), result);
    }
  }
}