44 lines
1.0 KiB
Go
44 lines
1.0 KiB
Go
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package httpimg
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import (
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"io"
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"net/http"
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"github.com/jung-kurt/gofpdf"
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)
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// httpimgPdf is a partial interface that only implements the functions we need
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// from the PDF generator to put the HTTP images on the PDF.
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type httpimgPdf interface {
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GetImageInfo(imageStr string) *gofpdf.ImageInfoType
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ImageTypeFromMime(mimeStr string) string
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RegisterImageReader(imgName, tp string, r io.Reader) *gofpdf.ImageInfoType
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SetError(err error)
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}
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// Register registers a HTTP image. Downloading the image from the provided URL
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// and adding it to the PDF but not adding it to the page. Use Image() with the
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// same URL to add the image to the page.
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func Register(f httpimgPdf, urlStr, tp string) (info *gofpdf.ImageInfoType) {
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info = f.GetImageInfo(urlStr)
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if info != nil {
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return
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}
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resp, err := http.Get(urlStr)
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if err != nil {
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f.SetError(err)
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return
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}
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defer resp.Body.Close()
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if tp == "" {
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tp = f.ImageTypeFromMime(resp.Header["Content-Type"][0])
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}
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return f.RegisterImageReader(urlStr, tp, resp.Body)
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}
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