testing

Dockerfile

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+FROM golang:latest
+
+MAINTAINER Andreas Neue <an@dnix.de>
+
+RUN apt -y update && \
+    apt -y upgrade && \
+    apt -y install libglib2.0-dev libexpat1-dev libjpeg-dev libpng-dev libgif-dev
+
+WORKDIR /go/src/image-resizer
+COPY . .
+
+RUN wget https://github.com/libvips/libvips/releases/download/v8.7.3/vips-8.7.3.tar.gz && \
+    tar xvzf vips-8.7.3.tar.gz && \
+    cd vips-8.7.3 && \
+    ./configure && \
+    make && \
+    make install
+
+RUN go get -v -u github.com/davidbyttow/govips/pkg/vips
+RUN go install -v ./...

main.go

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+// vi:ts=4:sts=4:sw=4:noet:tw=72
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/davidbyttow/govips/pkg/vips"
+)
+
+func main() {
+	// Start vips with the default configuration
+	vips.Startup(nil)
+	defer vips.Shutdown()
+
+	http.HandleFunc("/", resizeHandler)
+	log.Fatal(http.ListenAndServe("0.0.0.0:4444", nil))
+}
+
+func resizeHandler(w http.ResponseWriter, r *http.Request) {
+	// Get the query parameters from the request URL
+	path := r.URL.EscapedPath()
+	parm := strings.Split(path, "/")
+	if len(parm) < 3 {
+		w.Write([]byte(fmt.Sprintf("url, width and height are required")))
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+	queryUrl := parm[2]
+	size := strings.Split(parm[1], "x")
+	if len(size) < 2 {
+		w.Write([]byte(fmt.Sprintf("url, width and height are required")))
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+	queryWidth := size[0]
+	queryHeight := size[1]
+
+	// Validate that all three required fields are present
+	if queryUrl == "" || queryWidth == "" || queryHeight == "" {
+		w.Write([]byte(fmt.Sprintf("url, width and height are required")))
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	// Convert width and height to integers
+	width, errW := strconv.Atoi(queryWidth)
+	height, errH := strconv.Atoi(queryHeight)
+	if errW != nil || errH != nil {
+		w.Write([]byte(fmt.Sprintf("width and height must be integers")))
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	// Start fetching the image from the given url
+	resp, err := http.Get(queryUrl)
+	if err != nil {
+		w.Write([]byte(fmt.Sprintf("failed to get %s: %v", queryUrl, err)))
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	// Ensure that a valid response was given
+	if resp.StatusCode/100 != 2 {
+		w.Write([]byte(fmt.Sprintf("failed to get %s: status %d", queryUrl, resp.StatusCode)))
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+	defer resp.Body.Close()
+
+	// govips returns the output of the image as a []byte object. We don't need
+	// it since we are directly piping it to the ResponseWriter
+	_, _, err = vips.NewTransform().
+		Load(resp.Body).
+		ResizeStrategy(vips.ResizeStrategyStretch).
+		Resize(width, height).
+		Output(w).
+		Apply()
+
+	if err != nil {
+		w.Write([]byte(fmt.Sprintf("failed to resize %s: %v", queryUrl, err)))
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+}