110 lines
3.2 KiB
Go
110 lines
3.2 KiB
Go
package headers
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import (
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"net/http"
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"regexp"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/utils/svg"
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)
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var (
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ImageTypeRegex = regexp.MustCompile(`^image/*`)
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SvgMimeTypeRegex = regexp.MustCompile(`^image/svg\+xml$`)
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TextTypeRegex = regexp.MustCompile(`^text/*`)
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VideoTypeRegex = regexp.MustCompile(`^video/*`)
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PdfTypeRegex = regexp.MustCompile(`application\/pdf`)
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AttachmentRegex = regexp.MustCompile(`^attachment`)
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InlineRegex = regexp.MustCompile(`^inline`)
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)
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// Mime types that can't be inlined. Usually subtypes of main types
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var forbiddenInlineTypes = []*regexp.Regexp{SvgMimeTypeRegex}
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// Mime types that can be inlined. We can add global types like "image/" or
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// specific types like "text/plain". If there is a specific type inside a global
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// allowed type that can't be inlined we must add it to the forbiddenInlineTypes var.
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// One example of this is the mime type "image". We allow all images to be
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// inlined except for SVGs.
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var allowedInlineTypes = []*regexp.Regexp{ImageTypeRegex, TextTypeRegex, VideoTypeRegex, PdfTypeRegex}
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func SafeContentHeaders(data []byte, contentDisposition string) (string, string) {
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contentType := safeContentType(data)
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contentDisposition = safeContentDisposition(contentType, contentDisposition)
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return contentType, contentDisposition
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}
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func safeContentType(data []byte) string {
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// Special case for svg because DetectContentType detects it as text
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if svg.Is(data) {
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return "image/svg+xml"
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}
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// Override any existing Content-Type header from other ResponseWriters
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contentType := http.DetectContentType(data)
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// If the content is text type, we set to plain, because we don't
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// want to render it inline if they're html or javascript
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if isType(contentType, TextTypeRegex) {
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return "text/plain; charset=utf-8"
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}
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return contentType
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}
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func safeContentDisposition(contentType string, contentDisposition string) string {
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// If the existing disposition is attachment we return that. This allow us
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// to force a download from GitLab (ie: RawController)
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if AttachmentRegex.MatchString(contentDisposition) {
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return contentDisposition
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}
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// Checks for mime types that are forbidden to be inline
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for _, element := range forbiddenInlineTypes {
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if isType(contentType, element) {
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return attachmentDisposition(contentDisposition)
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}
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}
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// Checks for mime types allowed to be inline
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for _, element := range allowedInlineTypes {
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if isType(contentType, element) {
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return inlineDisposition(contentDisposition)
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}
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}
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// Anything else is set to attachment
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return attachmentDisposition(contentDisposition)
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}
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func attachmentDisposition(contentDisposition string) string {
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if contentDisposition == "" {
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return "attachment"
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}
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if InlineRegex.MatchString(contentDisposition) {
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return InlineRegex.ReplaceAllString(contentDisposition, "attachment")
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}
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return contentDisposition
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}
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func inlineDisposition(contentDisposition string) string {
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if contentDisposition == "" {
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return "inline"
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}
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if AttachmentRegex.MatchString(contentDisposition) {
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return AttachmentRegex.ReplaceAllString(contentDisposition, "inline")
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}
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return contentDisposition
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}
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func isType(contentType string, mimeType *regexp.Regexp) bool {
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return mimeType.MatchString(contentType)
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}
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