39 lines
809 B
Go
39 lines
809 B
Go
package rest
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import (
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"net/http"
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"strconv"
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"strings"
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)
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// ParseSizeFromHeaders parses HTTP response headers to get the full file size.
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// Returns -1 if the headers did not exist or were invalid.
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func ParseSizeFromHeaders(headers http.Header) (size int64) {
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size = -1
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var contentLength = headers.Get("Content-Length")
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if len(contentLength) != 0 {
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var err error
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if size, err = strconv.ParseInt(contentLength, 10, 64); err != nil {
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return -1
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}
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}
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var contentRange = headers.Get("Content-Range")
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if len(contentRange) == 0 {
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return size
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}
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if !strings.HasPrefix(contentRange, "bytes ") {
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return -1
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}
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slash := strings.IndexRune(contentRange, '/')
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if slash < 0 {
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return -1
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}
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ret, err := strconv.ParseInt(contentRange[slash+1:], 10, 64)
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if err != nil {
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return -1
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}
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return ret
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}
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