80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
// Copyright (c) 2018, Drone.IO Inc
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// Copyright (c) 2021, Robert Kaussow <mail@thegeeklab.de>
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// Use of this source code is governed by an Apache 2.0 license that can be
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// found in the LICENSE file.
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package template
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"os"
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"strings"
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"text/template"
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)
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// Render parses and executes a template, returning the results in string
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// format. Trailing or leading spaces or new-lines are not getting truncated. It
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// is able to read templates from remote paths, local files or directly from the
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// string.
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func Render(ctx context.Context, client http.Client, templateString string, payload interface{}) (string, error) {
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var outString bytes.Buffer
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tpl := new(template.Template).Funcs(loadFuncMap())
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templateURL, err := url.Parse(templateString)
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if err == nil {
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switch templateURL.Scheme {
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case "http", "https":
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, templateURL.String(), nil)
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if err != nil {
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return "", fmt.Errorf("failed to create request: %w", err)
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}
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res, err := client.Do(req)
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if err != nil {
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return "", fmt.Errorf("failed to fetch: %w", err)
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}
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defer res.Body.Close()
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out, err := io.ReadAll(res.Body)
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if err != nil {
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return "", fmt.Errorf("failed to read: %w", err)
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}
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templateString = string(out)
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case "file":
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out, err := os.ReadFile(templateURL.Path)
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if err != nil {
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return "", fmt.Errorf("failed to read: %w", err)
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}
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templateString = string(out)
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}
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}
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tpl, err = tpl.Parse(templateString)
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if err != nil {
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return "", err
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}
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err = tpl.Execute(&outString, payload)
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return outString.String(), err
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}
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// RenderTrim parses and executes a template, returning the results in string
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// format. The result is trimmed to remove left and right padding and newlines
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// that may be added unintentially in the template markup.
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func RenderTrim(ctx context.Context, client http.Client, template string, playload interface{}) (string, error) {
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out, err := Render(ctx, client, template, playload)
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return strings.Trim(out, " \n"), err
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}
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