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September 1, 2019 05:50
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File main.go used to create and upload pdf to aws s3
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| package main | |
| import ( | |
| "bytes" | |
| "log" | |
| "net/http" | |
| "strconv" | |
| "text/template" | |
| "time" | |
| "github.com/SebastiaanKlippert/go-wkhtmltopdf" | |
| "github.com/aws/aws-sdk-go/aws" | |
| "github.com/aws/aws-sdk-go/aws/credentials" | |
| "github.com/aws/aws-sdk-go/aws/session" | |
| "github.com/aws/aws-sdk-go/service/s3" | |
| ) | |
| var ( | |
| endpoint string | |
| bucketName string | |
| region string | |
| ) | |
| func init() { | |
| endpoint = "http://localhost:4572/" | |
| bucketName = "test-bucket/" | |
| region = "us-east-1" | |
| } | |
| //RequestPDF struct | |
| type RequestPDF struct { | |
| body []byte | |
| } | |
| // Data struct, collection to append data to html | |
| type Data struct { | |
| Product []Product | |
| Image string | |
| InvoiceNo int | |
| Date string | |
| DueDate string | |
| DeliveryDate string | |
| PaymentMethod string | |
| } | |
| // Product struct, collection to list order product | |
| type Product struct { | |
| Item string | |
| Price float64 | |
| Qty float64 | |
| Subtotal float64 | |
| } | |
| func main() { | |
| // fill variable in dynamic page template | |
| var ( | |
| products []Product | |
| ) | |
| dt := time.Now() | |
| data := Data{ | |
| Image: "https://camo.githubusercontent.com/27a12a480bd0a8c936bc6cf3edf2ab0fcbd4dd38/68747470733a2f2f7261772e6769746875622e636f6d2f676f6c616e672d73616d706c65732f676f706865722d766563746f722f6d61737465722f676f706865722d736964655f706174682e706e67", | |
| InvoiceNo: 1, | |
| Date: dt.Format("01-02-2006"), | |
| DueDate: dt.Format("01-02-2006"), | |
| DeliveryDate: dt.Format("01-02-2006"), | |
| PaymentMethod: "Paypal", | |
| } | |
| products = append(products, Product{Item: "item", Price: 10000, Qty: 1, Subtotal: 10000}) | |
| products = append(products, Product{Item: "item2", Price: 20000, Qty: 2, Subtotal: 40000}) | |
| products = append(products, Product{Item: "item3", Price: 30000, Qty: 3, Subtotal: 90000}) | |
| data.Product = products | |
| r := &RequestPDF{} | |
| err := r.ParseTemplate("invoice.html", data) | |
| // create pdf from html | |
| pdfg, err := wkhtmltopdf.NewPDFGenerator() | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| pdfg.AddPage(wkhtmltopdf.NewPageReader(bytes.NewReader(r.body))) | |
| pdfg.Orientation.Set(wkhtmltopdf.OrientationPortrait) | |
| pdfg.Dpi.Set(300) | |
| err = pdfg.Create() | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| err = pdfg.WriteFile("./test.pdf") | |
| // if err != nil { | |
| // log.Fatal(err) | |
| // } | |
| // process sending to aws s3 | |
| s, err := session.NewSession(&aws.Config{ | |
| Region: aws.String(region), | |
| Endpoint: aws.String(endpoint), | |
| Credentials: credentials.NewStaticCredentials( | |
| "foo", // id | |
| "foo", // secret | |
| ""), // token can be left blank for now | |
| }) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| // Upload | |
| fileName, err := AddFileToS3(s, pdfg.Bytes()) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| log.Printf("Done with url file : %s%s%s", endpoint, bucketName, fileName) | |
| } | |
| // AddFileToS3 will upload a single file to S3, it will require a pre-built aws session | |
| // and will set file info like content type and encryption on the uploaded file. | |
| func AddFileToS3(s *session.Session, buffer []byte) (string, error) { | |
| fileName := strconv.FormatInt(time.Now().UTC().UnixNano(), 10) | |
| // Config settings: this is where you choose the bucket, filename, content-type etc. | |
| // of the file you're uploading. | |
| _, err := s3.New(s).PutObject(&s3.PutObjectInput{ | |
| Bucket: aws.String(bucketName), | |
| Key: aws.String(fileName), | |
| ACL: aws.String("public-read"), | |
| Body: bytes.NewReader(buffer), | |
| ContentLength: aws.Int64(int64(len(buffer))), | |
| ContentType: aws.String(http.DetectContentType(buffer)), | |
| ContentDisposition: aws.String("attachment"), | |
| ServerSideEncryption: aws.String("AES256"), | |
| }) | |
| return fileName, err | |
| } | |
| // ParseTemplate HTML from file | |
| func (r *RequestPDF) ParseTemplate(templateFileName string, data interface{}) error { | |
| t, err := template.ParseFiles(templateFileName) | |
| if err != nil { | |
| return err | |
| } | |
| buf := new(bytes.Buffer) | |
| if err = t.Execute(buf, data); err != nil { | |
| return err | |
| } | |
| r.body = buf.Bytes() | |
| return nil | |
| } |
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