Fhttp: add RegisterRemoteImage functionality.

This is a wrapper around manually having to download the image and
registering it. It registers an image based on it's URL, it will
download that image and add it to the PDF. It will however not add it
immediately to the page. This is done by calling `Image()` with the same
URL.

4 files changed, 70 insertions, 0 deletions

diff --git a/contrib/fhttp/fhttp.go b/contrib/fhttp/fhttp.go
new file mode 100644
index 0000000..119e30e
--- /dev/null
+++ b/contrib/fhttp/fhttp.go
@@ -0,0 +1,26 @@
+package fhttp
+
+import (
+	"github.com/jung-kurt/gofpdf"
+	"net/http"
+)
+
+// RegisterRemoteImage registers a remote image. Downloading the image from the
+// provided URL and adding it to the PDF but not adding it to the page. Use
+// Image() with the same URL to add the image to the page.
+func RegisterRemoteImage(f *gofpdf.Fpdf, urlStr, tp string) (info *gofpdf.ImageInfoType) {
+	resp, err := http.Get(urlStr)
+
+	if err != nil {
+		f.SetError(err)
+		return
+	}
+
+	defer resp.Body.Close()
+
+	if tp == "" {
+		tp = f.ImageTypeFromMime(resp.Header["Content-Type"][0])
+	}
+
+	return f.RegisterImageReader(urlStr, tp, resp.Body)
+}
diff --git a/contrib/fhttp/fhttp_test.go b/contrib/fhttp/fhttp_test.go
new file mode 100644
index 0000000..57bf175
--- /dev/null
+++ b/contrib/fhttp/fhttp_test.go
@@ -0,0 +1,43 @@
+package fhttp_test
+
+import (
+	"fmt"
+	"github.com/jung-kurt/gofpdf"
+	"github.com/jung-kurt/gofpdf/contrib/fhttp"
+	"path/filepath"
+)
+
+const (
+	cnGofpdfDir  = "./"
+	cnExampleDir = cnGofpdfDir + "/pdf"
+)
+
+func exampleFilename(baseStr string) string {
+	return filepath.Join(cnExampleDir, baseStr+".pdf")
+}
+
+func summary(err error, fileStr string) {
+	if err == nil {
+		fileStr = filepath.ToSlash(fileStr)
+		fmt.Printf("Successfully generated %s\n", fileStr)
+	} else {
+		fmt.Println(err)
+	}
+}
+
+func ExampleFpdf_AddRemoteImage() {
+	pdf := gofpdf.New("", "", "", "")
+	pdf.SetFont("Helvetica", "", 12)
+	pdf.SetFillColor(200, 200, 220)
+	pdf.AddPage()
+
+	url := "https://github.com/jung-kurt/gofpdf/raw/master/image/logo_gofpdf.jpg?raw=true"
+	fhttp.RegisterRemoteImage(pdf, url, "")
+	pdf.Image(url, 100, 100, 20, 20, false, "", 0, "")
+
+	fileStr := exampleFilename("Fpdf_AddRemoteImage")
+	err := pdf.OutputFileAndClose(fileStr)
+	summary(err, fileStr)
+	// Output:
+	// Successfully generated pdf/Fpdf_AddRemoteImage.pdf
+}
diff --git a/contrib/fhttp/pdf/.gitignore b/contrib/fhttp/pdf/.gitignore
new file mode 100644
index 0000000..a136337
--- /dev/null
+++ b/contrib/fhttp/pdf/.gitignore
@@ -0,0 +1 @@
+*.pdf
diff --git a/contrib/fhttp/pdf/.gitkeep b/contrib/fhttp/pdf/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/contrib/fhttp/pdf/.gitkeep