كيفية تحويل المستندات إلى PDF باستخدام Go Lang

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package main

import (
	"bytes"
	"errors"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"os"
	"path/filepath"
	"time"
)

func createReqBody(filePathToConvert string, authorName string, title string, keywords string, name string) (string, io.Reader, error) {
	var err error
	buf := new(bytes.Buffer)
	bw := multipart.NewWriter(buf)

	f, err := os.Open(filePathToConvert)
	if err != nil {
		return "", nil, err
	}
	defer f.Close()

	authorNameField, _ := bw.CreateFormField("authorName")
	authorNameField.Write([]byte(authorName))

	titleField, _ := bw.CreateFormField("title")
	titleField.Write([]byte(title))

	keywordsField, _ := bw.CreateFormField("keywords")
	keywordsField.Write([]byte(keywords))

	nameField, _ := bw.CreateFormField("name")
	nameField.Write([]byte(name))

	_, fileName := filepath.Split(filePathToConvert)
	fw1, _ := bw.CreateFormFile("file", fileName)
	io.Copy(fw1, f)

	bw.Close()
	return bw.FormDataContentType(), buf, nil
}

func submitPdfConversionTask(filePath string, rapidApiKey string) (string, error) {
	contType, reader, err := createReqBody(filePath, "Sebastian", "Final report",
		"Reports, Final", "Quarterly Final Report")
	if err != nil {
		return "", err
	}

	req, err := http.NewRequest("POST", "https://petadata-document-conversion-suite.p.rapidapi.com/SubmitPDFConversionTask", reader)
	req.Header.Add("Content-Type", contType)
	req.Header.Add("X-RapidAPI-Key", rapidApiKey)

	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil || resp.StatusCode != 200 {
		fmt.Println("Cannot upload file to convert error:", err)
		return "", err
	}
	defer resp.Body.Close()
	b, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	return string(b), nil
}

func getConversionTaskStatus(taskId string, rapidApiKey string) (string, error) {
	url := fmt.Sprintf("https://petadata-document-conversion-suite.p.rapidapi.com/GetConversionTaskStatus?taskId=%s", taskId)
	req, err := http.NewRequest("GET", url, nil)
	req.Header.Add("X-RapidAPI-Key", rapidApiKey)

	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil || resp.StatusCode != 200 {
		fmt.Println("Cannot check conversion status of task with error:", err)
		return "", err
	}
	defer resp.Body.Close()
	b, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	return string(b), nil
}

func downloadResult(taskId string, rapidApiKey string) ([]byte, error) {
	url := fmt.Sprintf("https://petadata-document-conversion-suite.p.rapidapi.com/DownloadResult?taskId=%s", taskId)
	req, err := http.NewRequest("GET", url, nil)
	req.Header.Add("X-RapidAPI-Key", rapidApiKey)

	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil || resp.StatusCode != 200 {
		fmt.Println("Cannot download converted file with error:", err)
		return nil, err
	}
	defer resp.Body.Close()
	b, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	return b, nil
}

func main() {
	filePathToConvert := "<FILE PATH TO CONVERT>"
	rapidApiKey := "<YOUR RAPIDAPI KEY HERE>"
	taskId, err := submitPdfConversionTask(filePathToConvert, rapidApiKey)
	if err != nil {
		panic(err)
	}
	retryCount := 0
	for retryCount < 100 {
		retryCount++
		time.Sleep(5 * time.Second)
		status, err := getConversionTaskStatus(taskId, rapidApiKey)
		if err != nil {
			panic(err)
		}
		if status == "Completed" {
			fileBytes, err := downloadResult(taskId, rapidApiKey)
			if err != nil {
				panic(err)
			}
			err = os.WriteFile("final_report.pdf", fileBytes, 0644)
			if err != nil {
				panic(err)
			}
			break
		} else if status == "Waiting" {
			continue
		} else if status == "Failed" {
			panic(errors.New("Cannot convert file"))
		} else {
			panic(errors.New("Cannot convert file"))
		}
	}
}