| 1 | package bot |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "encoding/json" |
| 6 | "fmt" |
| 7 | "io" |
| 8 | "net/http" |
| 9 | "net/url" |
| 10 | "strings" |
| 11 | "sync" |
| 12 | "time" |
| 13 | ) |
| 14 | |
| 15 | // The Go port of agent/dnsimple.mjs: a tiny DNSimple client for the |
| 16 | // connected-services prototype (docs/connected-services.md). The access token |
| 17 | // arrives inside a time-boxed, sealed capability grant, is held only for the |
| 18 | // duration of one call, and is never persisted on this host. |
| 19 | |
| 20 | // dnsimpleClient talks to the DNSimple API (base overridable for tests via |
| 21 | // LCHAT_DNSIMPLE_BASE) and to the connect broker for the confidential OAuth |
| 22 | // exchange (the broker holds the client_secret; this sidecar never does). |
| 23 | type dnsimpleClient struct { |
| 24 | base string |
| 25 | http *http.Client |
| 26 | } |
| 27 | |
| 28 | func newDNSimpleClient(base string) *dnsimpleClient { |
| 29 | if base == "" { |
| 30 | base = "https://api.dnsimple.com" |
| 31 | } |
| 32 | return &dnsimpleClient{base: strings.TrimRight(base, "/"), http: &http.Client{Timeout: 30 * time.Second}} |
| 33 | } |
| 34 | |
| 35 | // apiGet does an authorized GET and decodes JSON, surfacing DNSimple's error |
| 36 | // message on a non-2xx (matching the Node client's error text). |
| 37 | func (c *dnsimpleClient) apiGet(token, path string, out any) error { |
| 38 | req, err := http.NewRequest("GET", c.base+path, nil) |
| 39 | if err != nil { |
| 40 | return err |
| 41 | } |
| 42 | req.Header.Set("Authorization", "Bearer "+token) |
| 43 | req.Header.Set("Accept", "application/json") |
| 44 | resp, err := c.http.Do(req) |
| 45 | if err != nil { |
| 46 | return err |
| 47 | } |
| 48 | defer resp.Body.Close() |
| 49 | body, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20)) |
| 50 | if resp.StatusCode/100 != 2 { |
| 51 | if msg := jsonMessage(body); msg != "" { |
| 52 | return fmt.Errorf("%s", msg) |
| 53 | } |
| 54 | return fmt.Errorf("DNSimple %d", resp.StatusCode) |
| 55 | } |
| 56 | if out != nil { |
| 57 | return json.Unmarshal(body, out) |
| 58 | } |
| 59 | return nil |
| 60 | } |
| 61 | |
| 62 | // jsonMessage pulls a {"message": "..."} field out of an error body, if present. |
| 63 | func jsonMessage(body []byte) string { |
| 64 | var e struct { |
| 65 | Message string `json:"message"` |
| 66 | } |
| 67 | _ = json.Unmarshal(body, &e) |
| 68 | return e.Message |
| 69 | } |
| 70 | |
| 71 | // whoami resolves the single account the token acts for. A user token spanning |
| 72 | // several accounts has no single account id — we refuse it, since registrar |
| 73 | // calls are account-scoped and we won't guess which account to spend from. |
| 74 | func (c *dnsimpleClient) whoami(token string) (int64, error) { |
| 75 | var d struct { |
| 76 | Data struct { |
| 77 | Account struct { |
| 78 | ID int64 `json:"id"` |
| 79 | } `json:"account"` |
| 80 | } `json:"data"` |
| 81 | } |
| 82 | if err := c.apiGet(token, "/v2/whoami", &d); err != nil { |
| 83 | return 0, err |
| 84 | } |
| 85 | if d.Data.Account.ID == 0 { |
| 86 | return 0, fmt.Errorf("that token isn't scoped to a single account — create an account access token") |
| 87 | } |
| 88 | return d.Data.Account.ID, nil |
| 89 | } |
| 90 | |
| 91 | // Domain is one row for the DNSimple app's table. |
| 92 | type Domain struct { |
| 93 | Name string `json:"name"` |
| 94 | State string `json:"state"` |
| 95 | AutoRenew bool `json:"auto_renew"` |
| 96 | ExpiresOn string `json:"expires_on"` |
| 97 | AccountID int64 `json:"account_id"` |
| 98 | Price *float64 `json:"price,omitempty"` |
| 99 | } |
| 100 | |
| 101 | // listDomains returns the account's domains with best-effort per-domain renewal |
| 102 | // pricing (bounded concurrency — the list payload omits price). A pricing |
| 103 | // failure leaves that row's price nil ("—" in the app), never fails the list. |
| 104 | func (c *dnsimpleClient) listDomains(token string) ([]Domain, error) { |
| 105 | account, err := c.whoami(token) |
| 106 | if err != nil { |
| 107 | return nil, err |
| 108 | } |
| 109 | var d struct { |
| 110 | Data []struct { |
| 111 | Name string `json:"name"` |
| 112 | State string `json:"state"` |
| 113 | AutoRenew bool `json:"auto_renew"` |
| 114 | ExpiresOn string `json:"expires_on"` |
| 115 | AccountID int64 `json:"account_id"` |
| 116 | } `json:"data"` |
| 117 | } |
| 118 | if err := c.apiGet(token, fmt.Sprintf("/v2/%d/domains?per_page=100", account), &d); err != nil { |
| 119 | return nil, err |
| 120 | } |
| 121 | rows := make([]Domain, 0, len(d.Data)) |
| 122 | for _, r := range d.Data { |
| 123 | if r.Name == "" { |
| 124 | continue |
| 125 | } |
| 126 | acct := r.AccountID |
| 127 | if acct == 0 { |
| 128 | acct = account |
| 129 | } |
| 130 | rows = append(rows, Domain{Name: r.Name, State: r.State, AutoRenew: r.AutoRenew, ExpiresOn: r.ExpiresOn, AccountID: acct}) |
| 131 | } |
| 132 | // Fetch renewal prices with at most 8 requests in flight. |
| 133 | sem := make(chan struct{}, 8) |
| 134 | var wg sync.WaitGroup |
| 135 | for i := range rows { |
| 136 | wg.Add(1) |
| 137 | go func(i int) { |
| 138 | defer wg.Done() |
| 139 | sem <- struct{}{} |
| 140 | defer func() { <-sem }() |
| 141 | var p struct { |
| 142 | Data struct { |
| 143 | RenewalPrice *float64 `json:"renewal_price"` |
| 144 | RegistrationPrice *float64 `json:"registration_price"` |
| 145 | } `json:"data"` |
| 146 | } |
| 147 | path := fmt.Sprintf("/v2/%d/registrar/domains/%s/prices", account, url.PathEscape(rows[i].Name)) |
| 148 | if c.apiGet(token, path, &p) != nil { |
| 149 | return // pricing is best-effort |
| 150 | } |
| 151 | if p.Data.RenewalPrice != nil { |
| 152 | rows[i].Price = p.Data.RenewalPrice |
| 153 | } else if p.Data.RegistrationPrice != nil { |
| 154 | rows[i].Price = p.Data.RegistrationPrice |
| 155 | } |
| 156 | }(i) |
| 157 | } |
| 158 | wg.Wait() |
| 159 | return rows, nil |
| 160 | } |
| 161 | |
| 162 | // tokenPair is what the broker's exchange/refresh answer: an access token, |
| 163 | // and — for providers with expiring user tokens (GitHub Apps) — the rotated |
| 164 | // refresh token and lifetime. |
| 165 | type tokenPair struct { |
| 166 | Access string `json:"access_token"` |
| 167 | Refresh string `json:"refresh_token"` |
| 168 | ExpiresIn int64 `json:"expires_in"` // seconds; 0 = non-expiring |
| 169 | } |
| 170 | |
| 171 | // sealable renders the pair as the member-blob shape (docs/integrations.md): |
| 172 | // what the client stores sealed to its own key and what a renewed pair rides |
| 173 | // back as. Absent fields are omitted so non-expiring providers keep the |
| 174 | // legacy {secret} shape. |
| 175 | func (p *tokenPair) sealable() map[string]any { |
| 176 | out := map[string]any{"secret": p.Access} |
| 177 | if p.Refresh != "" { |
| 178 | out["refresh"] = p.Refresh |
| 179 | } |
| 180 | if p.ExpiresIn > 0 { |
| 181 | out["expires_at"] = time.Now().UnixMilli() + p.ExpiresIn*1000 |
| 182 | } |
| 183 | return out |
| 184 | } |
| 185 | |
| 186 | // exchangeViaBroker swaps an authorization code for a token pair via the |
| 187 | // connect broker (docs/connected-services.md), for any service the broker has |
| 188 | // an OAuth app for; refreshViaBroker rotates an expiring pair the same way. |
| 189 | // These providers are confidential clients — both calls need the |
| 190 | // client_secret, which lives ONLY on the broker; this sidecar authenticates |
| 191 | // with a per-instance bearer token and gets back just the member's tokens |
| 192 | // (which the caller seals to the member and drops). |
| 193 | func exchangeViaBroker(service, code, state, brokerURL, brokerToken string) (*tokenPair, error) { |
| 194 | return brokerTokenCall("/api/exchange", map[string]string{"service": service, "code": code, "state": state}, brokerURL, brokerToken) |
| 195 | } |
| 196 | |
| 197 | func refreshViaBroker(service, refresh, brokerURL, brokerToken string) (*tokenPair, error) { |
| 198 | return brokerTokenCall("/api/refresh", map[string]string{"service": service, "refresh_token": refresh}, brokerURL, brokerToken) |
| 199 | } |
| 200 | |
| 201 | func brokerTokenCall(path string, payload map[string]string, brokerURL, brokerToken string) (*tokenPair, error) { |
| 202 | if brokerURL == "" || brokerToken == "" { |
| 203 | return nil, fmt.Errorf("connect broker not configured on this sidecar (set LCHAT_CONNECT_BROKER_URL/_TOKEN)") |
| 204 | } |
| 205 | body, _ := json.Marshal(payload) |
| 206 | req, err := http.NewRequest("POST", strings.TrimRight(brokerURL, "/")+path, bytes.NewReader(body)) |
| 207 | if err != nil { |
| 208 | return nil, err |
| 209 | } |
| 210 | req.Header.Set("Content-Type", "application/json") |
| 211 | req.Header.Set("Authorization", "Bearer "+brokerToken) |
| 212 | resp, err := (&http.Client{Timeout: 30 * time.Second}).Do(req) |
| 213 | if err != nil { |
| 214 | return nil, err |
| 215 | } |
| 216 | defer resp.Body.Close() |
| 217 | raw, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20)) |
| 218 | var d struct { |
| 219 | tokenPair |
| 220 | Message string `json:"message"` |
| 221 | } |
| 222 | _ = json.Unmarshal(raw, &d) |
| 223 | if resp.StatusCode/100 != 2 || d.Access == "" { |
| 224 | if d.Message != "" { |
| 225 | return nil, fmt.Errorf("%s", d.Message) |
| 226 | } |
| 227 | return nil, fmt.Errorf("broker %s %d", strings.TrimPrefix(path, "/api/"), resp.StatusCode) |
| 228 | } |
| 229 | return &d.tokenPair, nil |
| 230 | } |
| 231 | |
amadan