feat: support specifiying multiple credential sources (#320)

* feat: `leetcode.credentials.from` supports multiple sources

* Add doc

Author: j178

Diff for: README.md

@@ -258,7 +258,8 @@ leetcode:
   # Credentials to access LeetCode.
   credentials:
     # How to provide credentials: browser, cookies, password or none.
-    from: browser
+    from:
+      - browser
     # Browsers to get cookies from: chrome, safari, edge or firefox. If empty, all browsers will be tried. Only used when 'from' is 'browser'.
     browsers: []
 contest:
@@ -322,6 +323,11 @@ There are three ways to make cookies available to `leetgo`:
       from: password
   ```
 
+> [!TIP]
+> You can specify which browser to read cookies from, e.g. `browsers: [chrome]`.
+> You can specify multiple authentication methods, `leetgo` will try them in order, e.g. `from: [browser, cookies]`.
+> You can put all the environment variables in a `.env` file in the project's root directory, `leetgo` will automatically read them.
+
 > [!NOTE]
 > Password authentication is not recommended, and it is not supported by `leetcode.com`.
 

Diff for: README_zh.md

@@ -254,7 +254,8 @@ leetcode:
   # Credentials to access LeetCode.
   credentials:
     # How to provide credentials: browser, cookies, password or none.
-    from: browser
+    from:
+      - browser
     # Browsers to get cookies from: chrome, safari, edge or firefox. If empty, all browsers will be tried. Only used when 'from' is 'browser'.
     browsers: []
 contest:
@@ -296,6 +297,10 @@ editor:
       from: browser
   ```
 
+  > [!IMPORTANT]  
+  On Windows, Chrome/Edge v127 enabled [App-Bound Encryption](https://security.googleblog.com/2024/07/improving-security-of-chrome-cookies-on.html) and `leetgo` can no longer decrypt cookies from Chrome/Edge.
+  You would need to provide cookies manually or use other browsers.
+
 - 手动提供 Cookie
 
   你需要打开 LeetCode 页面，从浏览器的 DevTools 中获取 `LEETCODE_SESSION` 和 `csrftoken` 这两个 Cookie 的值，设置为 `LEETCODE_SESSION` 和 `LEETCODE_CSRFTOKEN` 环境变量。如果你在使用 `leetcode.com`, 你还需要设置 `LEETCODE_CFCLEARANCE` 为 `cf_clearance` cookie 的值。
@@ -314,11 +319,14 @@ editor:
       from: password
   ```
 
+> [!TIP]
+> 你可以指定读取哪个浏览器的 Cookie，比如 `browsers: [chrome]`。
+> 你可以指定多种方式，`leetgo` 会按照顺序尝试，比如 `from: [browser, cookies]`。
+> 你可以将 `LEETCODE_XXX` 等环境变量放到项目根目录的 `.env` 文件中，`leetgo` 会自动读取这个文件。
+
 > [!NOTE]
 > 不推荐使用用户名密码的认证方式, 而且 `leetcode.com` (美国站) 也不支持用户名密码登录.
 
-你可以将这些环境变量放到项目跟目录的 `.env` 文件中，`leetgo` 会自动读取这个文件。
-
 ## 进阶用法
 
 ### `testcases.txt` 相关

Diff for: config/config.go

@@ -111,10 +111,27 @@ type RustConfig struct {
 }
 
 type Credentials struct {
-	From     string   `yaml:"from" mapstructure:"from" comment:"How to provide credentials: browser, cookies, password or none."`
+	From     []string `yaml:"from" mapstructure:"from" comment:"How to provide credentials: browser, cookies, password or none."`
 	Browsers []string `yaml:"browsers" mapstructure:"browsers" comment:"Browsers to get cookies from: chrome, safari, edge or firefox. If empty, all browsers will be tried. Only used when 'from' is 'browser'."`
 }
 
+func (c *Credentials) UnmarshalYAML(node *yaml.Node) error {
+	// Compatibility with old `from` field, which is a string.
+	var from string
+	if err := node.Decode(&from); err == nil {
+		c.From = []string{from}
+		return nil
+	}
+
+	type credentials Credentials
+	var cred credentials
+	if err := node.Decode(&cred); err != nil {
+		return err
+	}
+	*c = Credentials(cred)
+	return nil
+}
+
 type LeetCodeConfig struct {
 	Site        LeetcodeSite `yaml:"site" mapstructure:"site" comment:"LeetCode site, https://leetcode.com or https://leetcode.cn"`
 	Credentials Credentials  `yaml:"credentials" mapstructure:"credentials" comment:"Credentials to access LeetCode."`
@@ -230,7 +247,7 @@ func defaultConfig() *Config {
 		LeetCode: LeetCodeConfig{
 			Site: LeetCodeCN,
 			Credentials: Credentials{
-				From: "browser",
+				From: []string{"browser"},
 			},
 		},
 		Editor: Editor{
@@ -276,11 +293,13 @@ func verify(c *Config) error {
 		return fmt.Errorf("invalid `leetcode.site` value: %s", c.LeetCode.Site)
 	}
 
-	if !credentialFrom[c.LeetCode.Credentials.From] {
-		return fmt.Errorf("invalid `leetcode.credentials.from` value: %s", c.LeetCode.Credentials.From)
-	}
-	if c.LeetCode.Credentials.From == "password" && c.LeetCode.Site == LeetCodeUS {
-		return errors.New("username/password authentication is not supported for leetcode.com")
+	for _, from := range c.LeetCode.Credentials.From {
+		if !credentialFrom[from] {
+			return fmt.Errorf("invalid `leetcode.credentials.from` value: %s", from)
+		}
+		if from == "password" && c.LeetCode.Site == LeetCodeUS {
+			return errors.New("username/password authentication is not supported for leetcode.com")
+		}
 	}
 
 	if c.Editor.Args != "" {

Diff for: leetcode/credential.go

@@ -20,6 +20,7 @@ import (
 )
 
 type CredentialsProvider interface {
+	Source() string
 	AddCredentials(req *http.Request) error
 }
 
@@ -37,6 +38,10 @@ func NonAuth() CredentialsProvider {
 	return &nonAuth{}
 }
 
+func (n *nonAuth) Source() string {
+	return "none"
+}
+
 func (n *nonAuth) AddCredentials(req *http.Request) error {
 	return errors.New("no credentials provided")
 }
@@ -53,6 +58,10 @@ func NewCookiesAuth(session, csrftoken, cfClearance string) CredentialsProvider
 	return &cookiesAuth{LeetCodeSession: session, CsrfToken: csrftoken, CfClearance: cfClearance}
 }
 
+func (c *cookiesAuth) Source() string {
+	return "cookies"
+}
+
 func (c *cookiesAuth) AddCredentials(req *http.Request) error {
 	if !c.hasAuth() {
 		return errors.New("cookies not found")
@@ -83,6 +92,10 @@ func NewPasswordAuth(username, passwd string) CredentialsProvider {
 	return &passwordAuth{username: username, password: passwd}
 }
 
+func (p *passwordAuth) Source() string {
+	return "password"
+}
+
 func (p *passwordAuth) SetClient(c Client) {
 	p.c = c
 }
@@ -135,6 +148,10 @@ func NewBrowserAuth(browsers []string) CredentialsProvider {
 	return &browserAuth{browsers: browsers}
 }
 
+func (b *browserAuth) Source() string {
+	return "browser"
+}
+
 func (b *browserAuth) SetClient(c Client) {
 	b.c = c
 }
@@ -207,21 +224,68 @@ func (b *browserAuth) Reset() {
 	b.CsrfToken = ""
 }
 
+type combinedAuth struct {
+	providers []CredentialsProvider
+}
+
+func NewCombinedAuth(providers ...CredentialsProvider) CredentialsProvider {
+	return &combinedAuth{providers: providers}
+}
+
+func (c *combinedAuth) Source() string {
+	return "combined sources"
+}
+
+func (c *combinedAuth) AddCredentials(req *http.Request) error {
+	for _, p := range c.providers {
+		if err := p.AddCredentials(req); err == nil {
+			return nil
+		} else {
+			log.Debug("read credentials from %s failed: %v", p.Source(), err)
+		}
+	}
+	return errors.New("no credentials provided")
+}
+
+func (c *combinedAuth) SetClient(client Client) {
+	for _, p := range c.providers {
+		if r, ok := p.(NeedClient); ok {
+			r.SetClient(client)
+		}
+	}
+}
+
+func (c *combinedAuth) Reset() {
+	for _, p := range c.providers {
+		if r, ok := p.(ResettableProvider); ok {
+			r.Reset()
+		}
+	}
+}
+
 func ReadCredentials() CredentialsProvider {
 	cfg := config.Get()
-	switch cfg.LeetCode.Credentials.From {
-	case "browser":
-		return NewBrowserAuth(cfg.LeetCode.Credentials.Browsers)
-	case "password":
-		username := os.Getenv("LEETCODE_USERNAME")
-		password := os.Getenv("LEETCODE_PASSWORD")
-		return NewPasswordAuth(username, password)
-	case "cookies":
-		session := os.Getenv("LEETCODE_SESSION")
-		csrfToken := os.Getenv("LEETCODE_CSRFTOKEN")
-		cfClearance := os.Getenv("LEETCODE_CFCLEARANCE")
-		return NewCookiesAuth(session, csrfToken, cfClearance)
-	default:
+	var providers []CredentialsProvider
+	for _, from := range cfg.LeetCode.Credentials.From {
+		switch from {
+		case "browser":
+			providers = append(providers, NewBrowserAuth(cfg.LeetCode.Credentials.Browsers))
+		case "password":
+			username := os.Getenv("LEETCODE_USERNAME")
+			password := os.Getenv("LEETCODE_PASSWORD")
+			providers = append(providers, NewPasswordAuth(username, password))
+		case "cookies":
+			session := os.Getenv("LEETCODE_SESSION")
+			csrfToken := os.Getenv("LEETCODE_CSRFTOKEN")
+			cfClearance := os.Getenv("LEETCODE_CFCLEARANCE")
+			providers = append(providers, NewCookiesAuth(session, csrfToken, cfClearance))
+		}
+	}
+	if len(providers) == 0 {
 		return NonAuth()
 	}
+	if len(providers) == 1 {
+		return providers[0]
+	}
+	return NewCombinedAuth(providers...)
 }