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feat: add tooltip support for PDF files (#374)
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| package defaultresolver | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "html" | ||
| "html/template" | ||
| "io" | ||
| "net/http" | ||
| "net/url" | ||
|
|
||
| "github.com/Chatterino/api/internal/logger" | ||
| "github.com/Chatterino/api/pkg/humanize" | ||
| "github.com/Chatterino/api/pkg/resolver" | ||
| "github.com/Chatterino/api/pkg/utils" | ||
| "github.com/pdfcpu/pdfcpu/pkg/api" | ||
| "github.com/pdfcpu/pdfcpu/pkg/pdfcpu" | ||
| "github.com/pdfcpu/pdfcpu/pkg/pdfcpu/validate" | ||
| ) | ||
|
|
||
| const templateString = `<div style="text-align: left;"> | ||
| <b>PDF File</b><br> | ||
| {{if .Title}}<b>Title:</b> {{.Title}}<br>{{end}} | ||
| {{if .Author}}<b>Author:</b> {{.Author}}<br>{{end}} | ||
| <span style="color: #808892;"> | ||
| {{.PageCount}} pages{{if .CreationDate}} • {{.CreationDate}}{{end}} | ||
| </span> | ||
| </div> | ||
| ` | ||
|
|
||
| var pdfTooltipTemplate = template.Must(template.New("pdfTooltipTemplate").Parse(templateString)) | ||
|
|
||
| type pdfTooltipData struct { | ||
| Title string | ||
| Author string | ||
| PageCount int | ||
| CreationDate string | ||
| } | ||
|
|
||
| type PDFResolver struct { | ||
| baseURL string | ||
| maxContentLength uint64 | ||
| } | ||
|
|
||
| func (r *PDFResolver) Check(ctx context.Context, contentType string) bool { | ||
| return contentType == "application/pdf" | ||
| } | ||
|
|
||
| func (r *PDFResolver) Run(ctx context.Context, req *http.Request, resp *http.Response) (*resolver.Response, error) { | ||
| log := logger.FromContext(ctx) | ||
|
|
||
| limiter := resolver.WriteLimiter{Limit: r.maxContentLength} | ||
| limitedReader := io.TeeReader(resp.Body, &limiter) | ||
| buffer, err := io.ReadAll(limitedReader) | ||
| if err != nil { | ||
| log.Errorw("error reading response body", "err", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| readSeeker := bytes.NewReader(buffer) | ||
|
|
||
| pdfCtx, err := api.ReadContext(readSeeker, pdfcpu.NewDefaultConfiguration()) | ||
| if err != nil { | ||
| log.Errorw("error reading pdf context", "err", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| if err = validate.XRefTable(pdfCtx.XRefTable); err != nil { | ||
| log.Errorw("error validating XRefTable", "err", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| dtString := "" | ||
| if creationDt, ok := pdfcpu.DateTime(pdfCtx.CreationDate, true); ok { | ||
| dtString = humanize.CreationDate(creationDt) | ||
| } | ||
|
|
||
| ttData := pdfTooltipData{ | ||
| Title: html.EscapeString(humanize.Title(pdfCtx.Title)), | ||
| Author: html.EscapeString(humanize.Title(pdfCtx.Author)), | ||
| PageCount: pdfCtx.PageCount, | ||
| CreationDate: dtString, | ||
| } | ||
|
|
||
| var tooltip bytes.Buffer | ||
| if err := pdfTooltipTemplate.Execute(&tooltip, ttData); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| targetURL := resp.Request.URL.String() | ||
| response := &resolver.Response{ | ||
| Status: http.StatusOK, | ||
| Link: targetURL, | ||
| Tooltip: url.PathEscape(tooltip.String()), | ||
| Thumbnail: utils.FormatThumbnailURL(r.baseURL, req, targetURL), | ||
| } | ||
|
|
||
| return response, nil | ||
| } | ||
|
|
||
| func (r *PDFResolver) Name() string { | ||
| return "PDFResolver" | ||
| } | ||
|
|
||
| func NewPDFResolver(baseURL string, maxContentLength uint64) *PDFResolver { | ||
| return &PDFResolver{ | ||
| baseURL: baseURL, | ||
| maxContentLength: maxContentLength, | ||
| } | ||
| } |
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