111 lines
3.0 KiB
Go
111 lines
3.0 KiB
Go
package qrApi
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import (
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"bytes"
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goqr "git.stuve.uni-ulm.de/stuve-it/stuve-it-backend/goqr"
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"git.stuve.uni-ulm.de/stuve-it/stuve-it-backend/logger"
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"github.com/labstack/echo/v5"
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"github.com/pocketbase/pocketbase"
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"github.com/pocketbase/pocketbase/apis"
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"github.com/pocketbase/pocketbase/core"
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"io"
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)
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// InitQRApi initializes ar code api endpoint
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//
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// this endpoint can be used to create qr codes
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// GET /api/qr/v1
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//
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// the endpoint expects the following query params:
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//
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// "data": "what to be encoded",
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// "ecc": "error correction level ('L', 'M' (default), 'Q', 'H')",
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// "scale": "scale of qr code (default 1), must be greater than 0",
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// "border": "border of qr code (default 1), must be equal or greater than 0, one is equal to one qr-code 'pixel'"
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// "color": "color of qr code (default #000000)"
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// "colorBackground": "background color of qr code (default #FFFFFF)",
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//
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// if the user is authenticated successfully the endpoint returns and apis.RecordAuthResponse
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func InitQRApi(app *pocketbase.PocketBase, e *core.ServeEvent) error {
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// add endpoint to app
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logger.LogInfoF("Adding QR API Endpoint")
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e.Router.GET("/api/qr/v1", func(c echo.Context) error {
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// get data from request
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data := struct {
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Data string `query:"data"`
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ECC string `query:"ecc"`
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Scale int `query:"scale"`
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Border int `query:"border"`
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ColorDark string `query:"color"`
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ColorLight string `query:"colorBackground"`
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}{}
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if err := c.Bind(&data); err != nil {
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return apis.NewBadRequestError("Failed to read request data", err)
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}
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// get correct error correction level
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var errCorLvl goqr.Ecc
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switch data.ECC {
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case "L":
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errCorLvl = goqr.Low
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case "M":
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errCorLvl = goqr.Medium
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case "Q":
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errCorLvl = goqr.Quartile
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case "H":
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errCorLvl = goqr.High
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default:
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errCorLvl = goqr.Medium
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}
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// encode data to qr code
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qrCode, err := goqr.EncodeText(data.Data, errCorLvl)
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if err != nil {
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return apis.NewBadRequestError("Failed to encode data to qr code", err)
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}
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// set default scale and border
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scale := data.Scale
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border := data.Border
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if scale == 0 {
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scale = 1
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}
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if border == 0 {
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border = 1
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}
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config := goqr.NewQrCodeImgConfig(scale, border)
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// create new buffer and writer
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var buffer bytes.Buffer
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writer := io.Writer(&buffer)
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// set default colors
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colorLight := data.ColorLight
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colorDark := data.ColorDark
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if colorLight == "" {
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colorLight = "#FFFFFF"
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}
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if colorDark == "" {
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colorDark = "#000000"
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}
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// write qr code to buffer
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err = qrCode.WriteAsSVG(config, writer, colorLight, colorDark)
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// return error if writing qr code to buffer fails
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if err != nil {
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logger.LogErrorF("Failed to write QR Code: %e", err)
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return apis.NewBadRequestError("Failed to write QR Code", err)
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}
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// return qr code as svg
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c.Response().Header().Set("Content-disposition", "attachment; filename=QR.svg")
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return c.Stream(200, "image/svg+xml", io.Reader(&buffer))
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}, apis.ActivityLogger(app))
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return nil
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}
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