/
request.go
174 lines (143 loc) · 4.35 KB
/
request.go
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package tgbot
import (
"bytes"
"encoding/json"
"errors"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"reflect"
"strconv"
"strings"
)
var httpClient = &http.Client{}
func sendResuest(method string, apiKey string, config interface{}, t interface{}) error {
var reader io.Reader
buffer, contentType := getRequestBuffer(extractParams(config))
if buffer != nil {
reader = buffer
}
request, err := http.NewRequest("POST", "https://api.telegram.org/bot"+apiKey+"/"+method, reader)
if err != nil {
return errors.New("unable to create request with given parameters")
}
if reader != nil {
request.Header.Add("Content-Type", contentType)
}
response, err := httpClient.Do(request)
if err != nil {
return errors.New("unable to execute request with given parameters")
}
defer response.Body.Close()
body, err := ioutil.ReadAll(response.Body)
if err != nil {
return errors.New("unable to read response body")
}
var apiResponse = apiResponse{}
err = json.Unmarshal(body, &apiResponse)
if err != nil {
return errors.New("unable to unserialize response from server")
}
if apiResponse.Ok != true {
return errors.New(apiResponse.Description)
}
err = json.Unmarshal(apiResponse.Result, &t)
if err != nil {
return errors.New("unable to unserialize API result")
}
return nil
}
func getRequestBuffer(params map[string]interface{}) (buffer *bytes.Buffer, contentType string) {
var requestBuffer bytes.Buffer
var hasParameters = false
writer := multipart.NewWriter(&requestBuffer)
defer writer.Close()
var addFileParameter = func(key string, value []byte, filename string) {
writer, _ := writer.CreateFormFile(key, filename)
writer.Write(value)
hasParameters = true
}
var addStringParameter = func(key string, value string) {
writer, _ := writer.CreateFormField(key)
writer.Write([]byte(value))
hasParameters = true
}
for key, value := range params {
if str, ok := value.(string); ok {
addStringParameter(key, str)
} else if param, ok := value.(*InputFile); ok {
fileData := param.getData()
if stringData, ok := fileData.(string); ok {
addStringParameter(key, stringData)
} else if bytesData, ok := fileData.([]byte); ok {
addFileParameter(key, bytesData, param.getFilename())
}
}
}
if !hasParameters {
return nil, ""
}
return &requestBuffer, writer.FormDataContentType()
}
func extractParams(config interface{}) map[string]interface{} {
var result = map[string]interface{}{}
if config == nil {
return result
}
configType := reflect.TypeOf(config)
configValue := reflect.ValueOf(config)
for i := 0; i < configType.NumField(); i++ {
field := configType.Field(i)
configField := configValue.FieldByName(field.Name)
zeroValue := reflect.Zero(configField.Type())
if reflect.DeepEqual(configField.Interface(), zeroValue.Interface()) {
continue
}
var extractedValue interface{}
switch v := configField.Interface().(type) {
case bool:
extractedValue = "true"
case int:
extractedValue = strconv.FormatInt(int64(v), 10)
case int64:
extractedValue = strconv.FormatInt(v, 10)
case float64:
extractedValue = strconv.FormatFloat(v, 'f', 6, 64)
case string, *InputFile:
extractedValue = v
case stringConfig:
extractedValue = v.getString()
case []string:
jsonBytes, _ := json.Marshal(v)
extractedValue = string(jsonBytes)
case []InlineQueryResult:
serializedQueryResults := []string{}
for _, queryResult := range v {
queryResultJSON := buildInlineQueryResult(queryResult, queryResult.getType())
serializedQueryResults = append(serializedQueryResults, queryResultJSON)
}
extractedValue = "[" + strings.Join(serializedQueryResults, ",") + "]"
default:
continue
}
result[field.Tag.Get("option")] = extractedValue
}
return result
}
func buildInlineQueryResult(queryResult InlineQueryResult, resultType string) string {
queryResultMap := map[string]interface{}{"type": resultType}
reflectType := reflect.TypeOf(queryResult)
reflectValue := reflect.ValueOf(queryResult)
for i := 0; i < reflectType.NumField(); i++ {
field := reflectType.Field(i)
if jsonAttribute, ok := field.Tag.Lookup("json"); ok {
val := reflectValue.FieldByName(field.Name).Interface()
if val != reflect.Zero(reflect.TypeOf(val)).Interface() {
queryResultMap[jsonAttribute] = val
}
}
}
queryResultJSON, _ := json.Marshal(queryResultMap)
return string(queryResultJSON)
}