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Implement input and redirect responses

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This commit is contained in:
Drew DeVault 2020-11-08 10:24:27 -05:00
parent 0ee3c853f3
commit 6531cf3930
1 changed files with 93 additions and 3 deletions
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96
main.go
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@ -215,6 +215,33 @@ var gemtextPage = template.Must(template.
</details>
`))
var inputPage = template.Must(template.
New("input").
Funcs(template.FuncMap{
"safeCSS": func(s string) template.CSS {
return template.CSS(s)
},
}).
Parse(`<!doctype html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1" />
{{- if .CSS }}
<style>
{{.CSS | safeCSS}}
</style>
{{- end }}
<title>{{.Prompt}}</title>
<form>
<label for="input">{{.Prompt}}</label>
{{ if .Secret }}
<input type="password" id="input" name="q" />
{{ else }}
<input type="text" id="input" name="q" />
{{ end }}
</form>
`))
// TODO: let user customize this
const defaultCSS = `html {
font-family: sans-serif;
@ -306,6 +333,27 @@ dl dt:not(:first-child) {
color: #333399;
}
}
label {
display: block;
font-weight: bold;
margin-bottom: 0.5rem;
}
input {
display: block;
border: 1px solid #888;
padding: .375rem;
line-height: 1.25rem;
transition: border-color .15s ease-in-out,box-shadow .15s ease-in-out;
width: 100%;
}
input:focus {
outline: 0;
border-color: #80bdff;
box-shadow: 0 0 0 0.2rem rgba(0,123,255,.25);
}
`
type GemtextContext struct {
@ -319,6 +367,13 @@ type GemtextContext struct {
Root *url.URL
}
type InputContext struct {
CSS string
Prompt string
Secret bool
URL *url.URL
}
type GemtextHeading struct {
Level int
Text string
@ -344,11 +399,41 @@ func proxyGemini(req gemini.Request, external bool, root *url.URL,
defer resp.Body.Close()
switch resp.Status {
case 10, 11:
w.Header().Add("Content-Type", "text/html")
err = inputPage.Execute(w, &InputContext{
CSS: defaultCSS,
Prompt: resp.Meta,
Secret: resp.Status == 11,
URL: req.URL,
})
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(fmt.Sprintf("%v", err)))
}
return
case 20:
break // OK
case 30, 31:
w.WriteHeader(http.StatusNotImplemented)
fmt.Fprintf(w, "This URL redirects to %s", resp.Meta)
to, err := url.Parse(resp.Meta)
if err != nil {
w.WriteHeader(http.StatusBadGateway)
w.Write([]byte(fmt.Sprintf("Gateway error: bad redirect %v", err)))
}
next := req.URL.ResolveReference(to)
if next.Scheme != "gemini" {
w.WriteHeader(http.StatusOK)
w.Write([]byte(fmt.Sprintf("This page is redirecting you to %s", next.String())))
return
}
next.Host = r.URL.Host
if external {
next.Path = fmt.Sprintf("/x/%s/%s", next.Host, next.Path)
}
next.Scheme = r.URL.Scheme
w.Header().Add("Location", next.String())
w.WriteHeader(http.StatusFound)
w.Write([]byte("Redirecting to " + next.String()))
return
case 40, 41, 42, 43, 44:
w.WriteHeader(http.StatusServiceUnavailable)
@ -372,7 +457,8 @@ func proxyGemini(req gemini.Request, external bool, root *url.URL,
m, _, err := mime.ParseMediaType(resp.Meta)
if err != nil {
w.WriteHeader(http.StatusBadGateway)
fmt.Fprintf(w, "Gateway error: %v", err)
w.Write([]byte(fmt.Sprintf("Gateway error: %d %s: %v",
resp.Status, resp.Meta, err)))
return
}
@ -456,6 +542,10 @@ func main() {
req.URL.Host = root.Host
req.URL.Path = r.URL.Path
req.Host = root.Host
q := r.URL.Query()
if x, ok := q["q"]; ok {
req.URL.RawQuery = x[0]
}
proxyGemini(req, false, root, w, r)
}))