Open Source Release
61 lines
1.9 KiB
Go
61 lines
1.9 KiB
Go
package clientnotify
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import (
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"context"
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"encoding/json"
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"fmt"
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"math/rand"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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)
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// vkBaseURL — VK's public API, no self-hosting concept like Telegram's,
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// same reasoning as MAX's own hardcoded maxBaseURL.
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const vkBaseURL = "https://api.vk.com/method"
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const vkAPIVersion = "5.199"
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// buildVkSendRequest — unlike Telegram/MAX's JSON bodies, messages.send
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// takes form-encoded params (verified against VK's current API docs) and
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// always answers HTTP 200 even on failure, with the error nested in the
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// body under "error" — see parseVkSendResponse.
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func buildVkSendRequest(ctx context.Context, text, groupToken, chatID string) (*http.Request, error) {
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form := url.Values{
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"user_id": {chatID},
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"message": {text},
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// VK's random_id is a 32-bit signed int in practice — a nanosecond
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// epoch value (~19 digits) overflows that and gets every send
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// rejected with VK error 100 ("invalid parameter"). rand.Int31()
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// stays within the accepted range.
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"random_id": {strconv.FormatInt(int64(rand.Int31()), 10)},
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"access_token": {groupToken},
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"v": {vkAPIVersion},
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, vkBaseURL+"/messages.send", strings.NewReader(form.Encode()))
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if err != nil {
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return nil, err
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}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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return req, nil
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}
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type vkSendError struct {
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ErrorCode int `json:"error_code"`
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ErrorMsg string `json:"error_msg"`
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}
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func parseVkSendResponse(body []byte) (string, error) {
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var out struct {
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Response json.Number `json:"response"`
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Error *vkSendError `json:"error"`
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}
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if err := json.Unmarshal(body, &out); err != nil {
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return "", fmt.Errorf("vk: malformed response: %w", err)
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}
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if out.Error != nil {
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return "", fmt.Errorf("vk: %d: %s", out.Error.ErrorCode, out.Error.ErrorMsg)
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}
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return out.Response.String(), nil
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}
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