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templates: Add fileExists and httpError template actions

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The httpError function isn't particularly useful until https://github.com/golang/go/issues/34201 is fixed in the Go standard lib.
This commit is contained in:
Matthew Holt 2021-01-11 13:49:20 -07:00
parent 0bf2046da7
commit 14f50d9dfb
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GPG Key ID: 2A349DD577D586A5
1 changed files with 24 additions and 2 deletions
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26
modules/caddyhttp/templates/tplcontext.go
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@ -153,7 +153,9 @@ func (c templateContext) executeTemplateInBuffer(tplName string, buf *bytes.Buff
"splitFrontMatter": c.funcSplitFrontMatter, "splitFrontMatter": c.funcSplitFrontMatter,
"listFiles": c.funcListFiles, "listFiles": c.funcListFiles,
"env": c.funcEnv, "env": c.funcEnv,
"placeholder": c.placeholder, "placeholder": c.funcPlaceholder,
"fileExists": c.funcFileExists,
"httpError": c.funcHTTPError,
}) })
parsedTpl, err := tpl.Parse(buf.String()) parsedTpl, err := tpl.Parse(buf.String())
@ -166,7 +168,7 @@ func (c templateContext) executeTemplateInBuffer(tplName string, buf *bytes.Buff
return parsedTpl.Execute(buf, c) return parsedTpl.Execute(buf, c)
} }
func (c templateContext) placeholder(name string) string { func (c templateContext) funcPlaceholder(name string) string {
repl := c.Req.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer) repl := c.Req.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
value, _ := repl.GetString(name) value, _ := repl.GetString(name)
return value return value
@ -323,6 +325,26 @@ func (c templateContext) funcListFiles(name string) ([]string, error) {
return names, nil return names, nil
} }
// funcFileExists returns true if filename can be opened successfully.
func (c templateContext) funcFileExists(filename string) (bool, error) {
if c.Root == nil {
return false, fmt.Errorf("root file system not specified")
}
file, err := c.Root.Open(filename)
if err == nil {
file.Close()
return true, nil
}
return false, nil
}
// funcHTTPError returns a structured HTTP handler error. EXPERIMENTAL.
// TODO: Requires https://github.com/golang/go/issues/34201 to be fixed.
// Example usage might be: `{{if not (fileExists $includeFile)}}{{httpError 404}}{{end}}`
func (c templateContext) funcHTTPError(statusCode int) (bool, error) {
return false, caddyhttp.Error(statusCode, nil)
}
// tplWrappedHeader wraps niladic functions so that they // tplWrappedHeader wraps niladic functions so that they
// can be used in templates. (Template functions must // can be used in templates. (Template functions must
// return a value.) // return a value.)