| 1 | package weixin |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "encoding/json" |
| 6 | "fmt" |
| 7 | "io" |
| 8 | "os" |
| 9 | "path/filepath" |
| 10 | "strings" |
| 11 | "time" |
| 12 | |
| 13 | "reasonix/internal/config" |
| 14 | "reasonix/internal/fileutil" |
| 15 | fileencoding "reasonix/internal/fileutil/encoding" |
| 16 | ) |
| 17 | |
| 18 | type savedAccount struct { |
| 19 | Token string `json:"token"` |
| 20 | BaseURL string `json:"base_url"` |
| 21 | UserID string `json:"user_id"` |
| 22 | SavedAt string `json:"saved_at"` |
| 23 | } |
| 24 | |
| 25 | type LoginResult struct { |
| 26 | AccountID string |
| 27 | Token string |
| 28 | BaseURL string |
| 29 | UserID string |
| 30 | } |
| 31 | |
| 32 | type LoginSession struct { |
| 33 | SessionKey string |
| 34 | QRCode string |
| 35 | QRCodeURL string |
| 36 | BaseURL string |
| 37 | StartedAt time.Time |
| 38 | } |
| 39 | |
| 40 | func weixinAccountDir(root string) string { |
| 41 | return filepath.Join(root, "weixin", "accounts") |
| 42 | } |
| 43 | |
| 44 | func savedAccountPath(accountID string) string { |
| 45 | root := config.MemoryUserDir() |
| 46 | if root == "" || accountID == "" { |
| 47 | return "" |
| 48 | } |
| 49 | if !validAccountID(accountID) { |
| 50 | return "" |
| 51 | } |
| 52 | return filepath.Join(weixinAccountDir(root), accountID+".json") |
| 53 | } |
| 54 | |
| 55 | func loadSavedAccount(accountID string) (savedAccount, error) { |
| 56 | path := savedAccountPath(accountID) |
| 57 | if path == "" { |
| 58 | return savedAccount{}, fmt.Errorf("reasonix user config dir is unavailable") |
| 59 | } |
| 60 | data, err := fileencoding.ReadFileUTF8(path) |
| 61 | if err != nil { |
| 62 | return savedAccount{}, err |
| 63 | } |
| 64 | var account savedAccount |
| 65 | if err := json.Unmarshal(data, &account); err != nil { |
| 66 | return savedAccount{}, err |
| 67 | } |
| 68 | return account, nil |
| 69 | } |
| 70 | |
| 71 | func loadAnySavedAccount() (savedAccount, error) { |
| 72 | root := config.MemoryUserDir() |
| 73 | if root == "" { |
| 74 | return savedAccount{}, fmt.Errorf("reasonix user config dir is unavailable") |
| 75 | } |
| 76 | entries, err := os.ReadDir(weixinAccountDir(root)) |
| 77 | if err != nil { |
| 78 | return savedAccount{}, err |
| 79 | } |
| 80 | for _, entry := range entries { |
| 81 | if entry.IsDir() || !strings.HasSuffix(entry.Name(), ".json") || strings.Contains(entry.Name(), "context-tokens") { |
| 82 | continue |
| 83 | } |
| 84 | accountID := strings.TrimSuffix(entry.Name(), ".json") |
| 85 | account, err := loadSavedAccount(accountID) |
| 86 | if err == nil && account.Token != "" { |
| 87 | return account, nil |
| 88 | } |
| 89 | } |
| 90 | return savedAccount{}, fmt.Errorf("no saved weixin account") |
| 91 | } |
| 92 | |
| 93 | func HasSavedAccount(accountID string) bool { |
| 94 | if accountID != "" { |
| 95 | account, err := loadSavedAccount(accountID) |
| 96 | return err == nil && account.Token != "" |
| 97 | } |
| 98 | account, err := loadSavedAccount("default") |
| 99 | if err == nil && account.Token != "" { |
| 100 | return true |
| 101 | } |
| 102 | account, err = loadAnySavedAccount() |
| 103 | return err == nil && account.Token != "" |
| 104 | } |
| 105 | |
| 106 | // validAccountID keeps an id from the upstream login response to one file name. |
| 107 | // validAccountID accepts one file name. Either separator is refused on every |
| 108 | // OS: the config directory can be read from a system where the other one is. |
| 109 | func validAccountID(accountID string) bool { |
| 110 | return !strings.ContainsAny(accountID, `/\`) && filepath.IsLocal(accountID) && filepath.Base(accountID) == accountID |
| 111 | } |
| 112 | |
| 113 | func saveAccount(accountID string, account savedAccount) error { |
| 114 | if !validAccountID(accountID) { |
| 115 | return fmt.Errorf("weixin account id %q is not a valid file name", accountID) |
| 116 | } |
| 117 | path := savedAccountPath(accountID) |
| 118 | if path == "" { |
| 119 | return fmt.Errorf("reasonix user config dir is unavailable") |
| 120 | } |
| 121 | if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil { |
| 122 | return err |
| 123 | } |
| 124 | data, err := json.MarshalIndent(account, "", " ") |
| 125 | if err != nil { |
| 126 | return err |
| 127 | } |
| 128 | // Atomic write: a truncated credentials file silently breaks login. |
| 129 | return fileutil.AtomicWriteFile(path, data, 0o600) |
| 130 | } |
| 131 | |
| 132 | func Login(ctx context.Context, out io.Writer, timeout time.Duration) (*LoginResult, error) { |
| 133 | if timeout <= 0 { |
| 134 | timeout = 8 * time.Minute |
| 135 | } |
| 136 | session, err := StartLogin(ctx) |
| 137 | if err != nil { |
| 138 | return nil, err |
| 139 | } |
| 140 | if out != nil { |
| 141 | fmt.Fprintln(out, "请使用微信扫描以下二维码链接：") |
| 142 | if session.QRCodeURL != "" { |
| 143 | fmt.Fprintln(out, session.QRCodeURL) |
| 144 | } else { |
| 145 | fmt.Fprintln(out, session.QRCode) |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | deadline := time.Now().Add(timeout) |
| 150 | for time.Now().Before(deadline) { |
| 151 | select { |
| 152 | case <-ctx.Done(): |
| 153 | return nil, ctx.Err() |
| 154 | case <-time.After(time.Second): |
| 155 | } |
| 156 | result, status, err := PollLogin(ctx, session) |
| 157 | if err != nil { |
| 158 | if out != nil { |
| 159 | fmt.Fprintf(out, "二维码状态查询失败: %v\n", err) |
| 160 | } |
| 161 | continue |
| 162 | } |
| 163 | if result != nil { |
| 164 | return result, nil |
| 165 | } |
| 166 | if out != nil { |
| 167 | switch status { |
| 168 | case "wait", "", "<nil>": |
| 169 | fmt.Fprint(out, ".") |
| 170 | case "scaned": |
| 171 | fmt.Fprintln(out, "\n已扫码，请在微信里确认...") |
| 172 | default: |
| 173 | fmt.Fprintf(out, "\n二维码状态: %s\n", status) |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | return nil, fmt.Errorf("weixin login timed out") |
| 178 | } |
| 179 | |
| 180 | func StartLogin(ctx context.Context) (*LoginSession, error) { |
| 181 | qrResp, err := ilinkGET(ctx, defaultWeixinAPI, getBotQRPath+"?bot_type=3") |
| 182 | if err != nil { |
| 183 | return nil, fmt.Errorf("fetch qr code: %w", err) |
| 184 | } |
| 185 | qrcode := fmt.Sprint(qrResp["qrcode"]) |
| 186 | qrcodeURL := fmt.Sprint(qrResp["qrcode_img_content"]) |
| 187 | if qrcode == "" || qrcode == "<nil>" { |
| 188 | return nil, fmt.Errorf("weixin qr response missing qrcode") |
| 189 | } |
| 190 | if qrcodeURL == "<nil>" { |
| 191 | qrcodeURL = "" |
| 192 | } |
| 193 | return &LoginSession{ |
| 194 | SessionKey: qrcode, |
| 195 | QRCode: qrcode, |
| 196 | QRCodeURL: qrcodeURL, |
| 197 | BaseURL: defaultWeixinAPI, |
| 198 | StartedAt: time.Now(), |
| 199 | }, nil |
| 200 | } |
| 201 | |
| 202 | func PollLogin(ctx context.Context, session *LoginSession) (*LoginResult, string, error) { |
| 203 | if session == nil || session.QRCode == "" { |
| 204 | return nil, "", fmt.Errorf("weixin login session is missing") |
| 205 | } |
| 206 | baseURL := session.BaseURL |
| 207 | if baseURL == "" { |
| 208 | baseURL = defaultWeixinAPI |
| 209 | } |
| 210 | statusResp, err := ilinkGET(ctx, baseURL, getQRStatusPath+"?qrcode="+session.QRCode) |
| 211 | if err != nil { |
| 212 | return nil, "", err |
| 213 | } |
| 214 | status := fmt.Sprint(statusResp["status"]) |
| 215 | switch status { |
| 216 | case "wait", "", "<nil>": |
| 217 | return nil, status, nil |
| 218 | case "scaned": |
| 219 | return nil, status, nil |
| 220 | case "scaned_but_redirect": |
| 221 | if host := fmt.Sprint(statusResp["redirect_host"]); host != "" && host != "<nil>" { |
| 222 | session.BaseURL = "https://" + host |
| 223 | } |
| 224 | return nil, status, nil |
| 225 | case "confirmed": |
| 226 | accountID := fmt.Sprint(statusResp["ilink_bot_id"]) |
| 227 | token := fmt.Sprint(statusResp["bot_token"]) |
| 228 | userID := fmt.Sprint(statusResp["ilink_user_id"]) |
| 229 | respBaseURL := fmt.Sprint(statusResp["baseurl"]) |
| 230 | if respBaseURL == "" || respBaseURL == "<nil>" { |
| 231 | respBaseURL = defaultWeixinAPI |
| 232 | } |
| 233 | if accountID == "" || accountID == "<nil>" || token == "" || token == "<nil>" { |
| 234 | return nil, status, fmt.Errorf("weixin qr confirmed but credential payload is incomplete") |
| 235 | } |
| 236 | account := savedAccount{ |
| 237 | Token: token, |
| 238 | BaseURL: respBaseURL, |
| 239 | UserID: userID, |
| 240 | SavedAt: time.Now().UTC().Format(time.RFC3339), |
| 241 | } |
| 242 | if err := saveAccount(accountID, account); err != nil { |
| 243 | return nil, status, err |
| 244 | } |
| 245 | if err := saveAccount("default", account); err != nil { |
| 246 | return nil, status, err |
| 247 | } |
| 248 | return &LoginResult{AccountID: accountID, Token: token, BaseURL: respBaseURL, UserID: userID}, status, nil |
| 249 | case "expired": |
| 250 | return nil, status, fmt.Errorf("weixin qr code expired; rerun login") |
| 251 | default: |
| 252 | return nil, status, nil |
| 253 | } |
| 254 | } |
| 255 |