Statically generating opentofu releases page: Fixes opentofu/opentofu#1131

releases_page/Readme.md

@@ -0,0 +1,5 @@
+# Opentofu Releases Page
+
+This Go program interacts with the GitHub API to retrieve release information about Opentofu. It is designed to generate HTML files, facilitating a user-friendly interface for navigating through the releases and downloading associated assets.
+
+The site is statically generated, ensuring that all HTML pages are created during the build stage. These pages are then subsequently deployed, enabling seamless access to release artifacts.

releases_page/main.go

@@ -0,0 +1,138 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"io"
+	"net/http"
+	"os"
+)
+
+// Templates for main page and release page
+const (
+	mainPageTemplate = `<ul>
+	<li>
+		<a href="../">../</a>
+	</li>
+	{{ range . }}
+	<li>{{ $releaseName := .name | trimV }}
+		<a href="./{{ $releaseName }}/">{{ printf "tofu_%s" $releaseName }}</a>
+	</li>
+	{{ end }}
+	</ul>`
+	releasePageTemplate = `<ul>
+	<li>
+		<a href="../">../</a>
+	</li>
+	{{ range . }}
+	<li>
+		<a href="{{ .browser_download_url }}">{{ .name }}</a>
+	</li>
+	{{end}}
+	</ul>`
+)
+
+func main() {
+	const (
+		githubAPIEndpoint = "https://api.github.com/repos/opentofu/opentofu/releases"
+		htmlFileName      = "index.html"
+	)
+
+	// Create client with custom user-agent
+	client := &http.Client{}
+	req, err := http.NewRequest("GET", githubAPIEndpoint, nil)
+	if err != nil {
+		fmt.Println("Error creating request: ", err)
+		return
+	}
+	req.Header.Set("User-Agent", "opentofu releases page")
+
+	// Fetch releases from GitHub API
+	response, err := client.Do(req)
+	if err != nil {
+		fmt.Println("Error fetching releases: ", err)
+		return
+	}
+	defer response.Body.Close()
+
+	body, err := io.ReadAll(response.Body)
+	if err != nil {
+		fmt.Println("Error reading response body: ", err)
+		return
+	}
+
+	// Unmarshal JSON response
+	releases := []map[string]interface{}{}
+	if err := json.Unmarshal(body, &releases); err != nil {
+		fmt.Println("Error unmarshalling JSON: ", err)
+		return
+	}
+
+	// Create main index.html file
+	htmlFile, err := os.Create(htmlFileName)
+	if err != nil {
+		fmt.Println("Error creating HTML file: ", err)
+		return
+	}
+	defer htmlFile.Close()
+
+	// Function to remove the first character of a string
+	funcMap := template.FuncMap{
+		"trimV": func(s string) string {
+			if len(s) <= 1 {
+				return ""
+			}
+			return s[1:]
+		},
+	}
+
+	// Parse mainPage template
+	mainPageTmpl, err := template.New("mainPageTemplate").Funcs(funcMap).Parse(mainPageTemplate)
+	if err != nil {
+		fmt.Println("Error parsing mainPage template: ", err)
+		return
+	}
+
+	// Execute the mainPage template and write to the main index.html
+	if err := mainPageTmpl.Execute(htmlFile, releases); err != nil {
+		fmt.Println("Error executing mainPage template: ", err)
+		return
+	}
+
+	// Parse releasePage template
+	releasePageTmpl, err := template.New("releasePageTemplate").Parse(releasePageTemplate)
+	if err != nil {
+		fmt.Println("Error parsing releasePage template: ", err)
+		return
+	}
+
+	// Iterate over releases to create release pages
+	for _, release := range releases {
+		// Extract version from release name
+		version := release["name"].(string)[1:]
+		path := version + "/"
+
+		// Create directory for each release
+		if err := os.Mkdir(path, 0755); err != nil && !os.IsExist(err) {
+			fmt.Println(fmt.Sprintf("Error creating %s directory: ", version), err)
+			return
+		}
+
+		// Create index.html file for release page
+		htmlFile, err := os.Create(path + htmlFileName)
+		if err != nil {
+			fmt.Println(fmt.Sprintf("Error creating HTML file, %s%s: ", path, htmlFileName), err)
+			return
+		}
+		defer htmlFile.Close()
+
+		// Execute releasePage template and write to releases' index.html
+		if assets, ok := release["assets"].([]interface{}); ok {
+			if err := releasePageTmpl.Execute(htmlFile, assets); err != nil {
+				fmt.Println(fmt.Sprintf("Error executing releasePage template for %s%s: ", path, htmlFileName), err)
+				return
+			}
+		}
+	}
+}