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‎.gitignore‎

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/public
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barcodeserver
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*.swp

‎Dockerfile‎

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FROM alpine:3.1
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RUN mkdir -p /opt/barcode/public
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VOLUME /opt/barcode/public
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RUN apk add --update ca-certificates
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COPY ./barcodeserver /opt/barcode/barcodeserver
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CMD ["/opt/barcode/barcodeserver"]
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‎Makefile‎

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project = barcodeserver
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all: build
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arm:
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CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=7 go build -a -tags netgo -ldflags '-w'
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build:
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CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -tags netgo -ldflags '-w'
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clean:
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rm petals
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docker: build
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docker build -t diogok/$(project) .
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docker-arm: arm
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docker build -t diogok/$(project):arm .
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push:
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docker push diogok/$(project)
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‎README.md‎

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# BarCodeServer
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Simple HTTP API around [https://github.com/boombuler/barcode](https://github.com/boombuler/barcode).
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## Api Usage
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Simply issue a get using the type of barcode desired as path and the content as queryString content and it will return a redirect to generated png.
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$ curl -X GET http://localhost:8080/datamatrix?content=Whatever%20data
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Available types:
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* codabar
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* code128
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* code39
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* ean
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* datamatrix
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* qr
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* 2of5
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In case of error it will return Bad Request 400 and error in plain/text.
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## Deploy
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Using the binary, download from the release page and run the binary and it will bind to port 8080.
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Using docker:
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$ docker run -p 8080:8080 -v /tmp/barcodes:/opt/barcode/public diogok/barcodeserver
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It will save generated code at public folder. You can delete generated artefacts and if requested server will regenerate.
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## License
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MIT , same as [https://github.com/boombuler/barcode](https://github.com/boombuler/barcode).
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‎barcodeserver.go‎

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package main
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import (
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"bufio"
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"crypto/sha1"
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"encoding/hex"
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"fmt"
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"github.com/boombuler/barcode"
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"github.com/boombuler/barcode/codabar"
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"github.com/boombuler/barcode/code128"
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"github.com/boombuler/barcode/code39"
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"github.com/boombuler/barcode/datamatrix"
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"github.com/boombuler/barcode/ean"
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"github.com/boombuler/barcode/qr"
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"github.com/boombuler/barcode/twooffive"
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"github.com/julienschmidt/httprouter"
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"image/png"
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"log"
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"net/http"
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"os"
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"strconv"
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)
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func IdToPath(id string) string {
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hasher := sha1.New()
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hasher.Write([]byte(id))
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hash := hex.EncodeToString(hasher.Sum(nil))
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path := fmt.Sprintf("%s/%s/%s.png", hash[0:2], hash[2:4], hash)
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os.MkdirAll(fmt.Sprintf("public/%s/%s", hash[0:2], hash[2:4]), 0755)
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return path
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}
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func Get(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
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bartype := p.ByName("type")
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content := r.URL.Query().Get("content")
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swidth := r.URL.Query().Get("width")
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sheight := r.URL.Query().Get("height")
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if swidth == "" {
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swidth = "0"
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}
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if sheight == "" {
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sheight = "0"
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}
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width, werr := strconv.Atoi(swidth)
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if werr != nil {
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log.Println(werr)
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w.WriteHeader(http.StatusBadRequest)
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fmt.Fprintf(w, "Error: %s", werr)
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return
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}
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height, herr := strconv.Atoi(sheight)
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if herr != nil {
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log.Println(herr)
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w.WriteHeader(http.StatusBadRequest)
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fmt.Fprintf(w, "Error: %s", herr)
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return
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}
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id := fmt.Sprintf("%s:%s:%d:%d", bartype, content, width, height)
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path := IdToPath(id)
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realPath := fmt.Sprintf("public/%s", path)
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if _, err := os.Stat(realPath); err == nil {
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http.Redirect(w, r, fmt.Sprintf("/%s", path), 307)
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return
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}
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var err error
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var initialBarcode barcode.Barcode
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switch bartype {
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case "datamatrix":
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initialBarcode, err = datamatrix.Encode(content)
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if width == 0 {
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width = 256
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}
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if height == 0 {
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height = 256
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}
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case "qr":
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initialBarcode, err = qr.Encode(content, qr.Q, qr.Auto)
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if width == 0 {
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width = 256
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}
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if height == 0 {
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height = 256
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}
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case "codabar":
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initialBarcode, err = codabar.Encode(content)
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if width == 0 {
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width = 256
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}
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if height == 0 {
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height = 50
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}
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case "code128":
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initialBarcode, err = code128.Encode(content)
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if width == 0 {
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width = 256
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}
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if height == 0 {
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height = 25
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}
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case "code39":
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initialBarcode, err = code39.Encode(content, true, true)
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if width == 0 {
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width = 256
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}
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if height == 0 {
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height = 25
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}
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case "ean":
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initialBarcode, err = ean.Encode(content)
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if width == 0 {
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width = 256
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}
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if height == 0 {
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height = 25
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}
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case "2of5":
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initialBarcode, err = twooffive.Encode(content, true)
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if width == 0 {
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width = 256
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}
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if height == 0 {
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height = 25
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}
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case "twooffive":
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initialBarcode, err = twooffive.Encode(content, true)
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if width == 0 {
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width = 256
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}
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if height == 0 {
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height = 25
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}
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}
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if err != nil {
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log.Println(err)
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "Error: %s", err)
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return
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} else if bartype == "" || initialBarcode == nil {
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log.Println("Bad type")
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w.WriteHeader(http.StatusBadRequest)
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fmt.Fprintf(w, "Error: %s", "Bad bar type")
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return
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} else {
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var serr error
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var finalBarcode barcode.Barcode
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if width != 0 && height != 0 {
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finalBarcode, serr = barcode.Scale(initialBarcode, width, height)
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} else {
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finalBarcode = initialBarcode
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}
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if serr != nil {
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log.Println(serr)
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "Error: %s", serr)
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return
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}
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file, ferr := os.Create(realPath)
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if ferr != nil {
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log.Println(ferr)
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "Error: %s", ferr)
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return
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}
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defer file.Close()
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writer := bufio.NewWriter(file)
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perr := png.Encode(writer, finalBarcode)
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if perr != nil {
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log.Println(perr)
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "Error: %s", perr)
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return
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}
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writer.Flush()
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http.Redirect(w, r, fmt.Sprintf("/%s", path), 307)
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}
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}
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func main() {
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sport := os.Getenv("PORT")
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var port string
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if len(sport) > 2 {
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port = sport
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} else {
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port = "8080"
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}
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log.Printf("Binding at 0.0.0.0:%s", port)
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router := httprouter.New()
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router.NotFound = http.FileServer(http.Dir("public"))
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router.GET("/", Get)
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router.GET("/:type", Get)
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log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", port), router))
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}

‎public/.placeholder‎

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placeholder

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