Initial code commit

2026-09-02 07:07:43 -04:00 · 2026-01-04 05:37:43 -05:00
parent 0af7ac5c9e
commit 7a4ef87470
11 changed files with 306 additions and 0 deletions
@@ -0,0 +1,108 @@
+package main
+
+import (
+	"encoding/base64"
+	"encoding/xml"
+	"fmt"
+	"os"
+
+	"github.com/gorilla/feeds"
+	"github.com/rwinkhart/backtone/atom"
+	"github.com/rwinkhart/backtone/bthtml"
+	"github.com/rwinkhart/go-boilerplate/other"
+)
+
+const cfgPath = "/etc/backtone.xml"
+
+// feedFieldInfo provides the string value for a given field in the parent feed
+// and specifies which index in the regex capture group to extract the same field
+// from per individual news item.
+// An index of -1 can be used to use the same value as the parent feed.
+// An index of -2 can be used to use a default (placeholder) value.
+type feedFieldInfoT struct {
+	Parent                string   `xml:"parent,omitempty"`
+	CaptureGroupConnector []string `xml:"captureGroupConnector,omitempty"`
+	CaptureGroupIndex     []int8   `xml:"captureGroupIndex,omitempty"`
+}
+type feedT struct {
+	Title       feedFieldInfoT `xml:"title"`
+	Link        feedFieldInfoT `xml:"link"`
+	Description feedFieldInfoT `xml:"description"`
+	AuthorName  feedFieldInfoT `xml:"authorName"`
+	AuthorEmail feedFieldInfoT `xml:"authorEmail"`
+}
+type inputT struct {
+	LoadSeconds     float32 `xml:"loadSeconds"`
+	Regex           string  `xml:"regex"`
+	FlareSolverrURL string  `xml:"flareSolverrURL"`
+	MaxFeedItems    int     `xml:"maxFeedItems"`
+	Feed            feedT   `xml:"feed"`
+}
+
+func main() {
+	// handle input argument (XML)
+	if len(os.Args) < 2 {
+		demoInputBytes, _ := xml.MarshalIndent(
+			inputT{
+				LoadSeconds:     2.5,
+				Regex:           "PLACEHOLDER",
+				FlareSolverrURL: "http://127.0.0.1:8191",
+				MaxFeedItems:    10,
+				Feed: feedT{
+					Title:       feedFieldInfoT{Parent: "Demo Title", CaptureGroupIndex: []int8{0}},
+					Link:        feedFieldInfoT{Parent: "https://example.com/", CaptureGroupIndex: []int8{1}},
+					Description: feedFieldInfoT{Parent: "Demo description", CaptureGroupConnector: []string{"Prefix - ", " - Middle - ", " - Suffix"}, CaptureGroupIndex: []int8{1, 3}},
+					AuthorName:  feedFieldInfoT{Parent: "John Doe", CaptureGroupIndex: []int8{3}},
+					AuthorEmail: feedFieldInfoT{Parent: "johndoe@example.com", CaptureGroupIndex: []int8{4}},
+				},
+			},
+			"",
+			"    ",
+		)
+		other.PrintError(os.Args[0]+" must be called with valid base64-encoded XML input using the following schema:\n\n"+string(demoInputBytes), 1)
+	}
+
+	// decode base64 input XML
+	decodedXML, err := base64.StdEncoding.DecodeString(os.Args[1])
+	if err != nil {
+		other.PrintError("Failed to decode base64 input XML: "+err.Error(), 1)
+	}
+
+	var inputInfo inputT
+	if err := xml.Unmarshal(decodedXML, &inputInfo); err != nil {
+		other.PrintError("Failed to unmarshal input XML: "+err.Error(), 1)
+	}
+
+	rawHTML, err := bthtml.GetFromURL(inputInfo.FlareSolverrURL, inputInfo.Feed.Link.Parent, inputInfo.LoadSeconds)
+	if err != nil {
+		other.PrintError("Failed to get HTML content: "+err.Error(), 1)
+	}
+
+	atomXML, err := atom.GetFromHTML(
+		&feeds.Feed{
+			Title:       inputInfo.Feed.Title.Parent,
+			Link:        &feeds.Link{Href: inputInfo.Feed.Link.Parent},
+			Description: inputInfo.Feed.Description.Parent,
+			Author:      &feeds.Author{Name: inputInfo.Feed.AuthorName.Parent, Email: inputInfo.Feed.AuthorEmail.Parent},
+		},
+		&rawHTML,
+		inputInfo.Regex,
+		atom.IndicesT{
+			TitleC:       inputInfo.Feed.Title.CaptureGroupConnector,
+			TitleI:       inputInfo.Feed.Title.CaptureGroupIndex,
+			LinkC:        inputInfo.Feed.Link.CaptureGroupConnector,
+			LinkI:        inputInfo.Feed.Link.CaptureGroupIndex,
+			DescriptionC: inputInfo.Feed.Description.CaptureGroupConnector,
+			DescriptionI: inputInfo.Feed.Description.CaptureGroupIndex,
+			AuthorNameC:  inputInfo.Feed.AuthorName.CaptureGroupConnector,
+			AuthorNameI:  inputInfo.Feed.AuthorName.CaptureGroupIndex,
+			AuthorEmailC: inputInfo.Feed.AuthorEmail.CaptureGroupConnector,
+			AuthorEmailI: inputInfo.Feed.AuthorEmail.CaptureGroupIndex,
+		},
+		inputInfo.MaxFeedItems,
+	)
+	if err != nil {
+		other.PrintError("Failed to generate Atom RSS feed from HTML:\n\n"+rawHTML+"\n\n"+err.Error(), 1)
+	}
+	fmt.Println(*atomXML)
+}