feat: add backlinks and outlinks routes

src/controllers/EntriesController.js

@@ -29,6 +29,31 @@ export default class EntriesController {
         return res.json(entries)
     }
 
+    getBacklinksForEntry = (req, res) => {
+        const title = req.params.title
+        const entries = this.entriesService.getBacklinksForEntry(title)
+        if (!entries) {
+            return res.status(404).json({
+                message: `Backlinks could not be retrieved for entry ${title}`,
+            })
+        }
+
+        return res.json(entries)
+    }
+
+    getOutlinksForEntry = (req, res) => {
+        const title = req.params.title
+        const entries = this.entriesService.getOutlinksForEntry(title)
+        if (!entries) {
+            return res.status(404).json({
+                message: `Outlinks could not be retrieved for entry ${title}`,
+            })
+        }
+
+        return res.json(entries)
+    }
+
+
     getEntriesForTag = (req, res) => {
         const tag = req.params.tag
         const sort = req.query.sort

src/routes/entries.js

@@ -9,5 +9,7 @@ const entriesController = new EntriesController(entriesService)
 
 router.get("/", entriesController.getAllEntries)
 router.get("/:title", entriesController.getEntry)
+router.get("/backlinks/:title", entriesController.getBacklinksForEntry)
+router.get("/outlinks/:title", entriesController.getOutlinksForEntry)
 router.get("/tag/:tag", entriesController.getEntriesForTag)
 export default router

src/services/EntriesService.js

@@ -1,4 +1,4 @@
-import { GET_ALL_ENTRIES, GET_ENTRY, GET_ENTRIES_FOR_TAG } from "../sql/entries.js"
+import { GET_ALL_ENTRIES, GET_ENTRY, GET_ENTRIES_FOR_TAG, GET_BACKLINKS_FOR_ENTRY, GET_OUTLINKS_FOR_ENTRY } from "../sql/entries.js"
 
 export default class EntriesService {
     database
@@ -36,6 +36,27 @@ export default class EntriesService {
         }
     }
 
+    getBacklinksForEntry = (title) => {
+        const backlinks = this.database.prepare(GET_BACKLINKS_FOR_ENTRY).all(title)
+        const sorted = this._sortByTitle(backlinks, "source_entry_title")
+        const list = sorted.flatMap((i) => i.source_entry_title)
+        return {
+            count: backlinks.length,
+            data: list
+        }
+    }
+
+    getOutlinksForEntry = (title) => {
+        const outlinks = this.database.prepare(GET_OUTLINKS_FOR_ENTRY).all(title)
+        const sorted = this._sortByTitle(outlinks, "target_entry_title")
+        const list = sorted.flatMap((i) => i.target_entry_title)
+        return {
+            count: outlinks.length,
+            data: list
+        }
+
+    }
+
     _sortByTitle = (entries, fieldName) => {
         return entries.sort((a, b) => a[fieldName].localeCompare(b[fieldName]))
     }

src/sql/entries.js

@@ -2,6 +2,11 @@ const GET_ENTRY = `SELECT * FROM entries WHERE title = ?`
 
 const GET_ALL_ENTRIES = `SELECT title, last_modified FROM entries`
 
+const GET_OUTLINKS_FOR_ENTRY = `SELECT target_entry_title FROM backlinks WHERE source_entry_title = ?` 
+
+const GET_BACKLINKS_FOR_ENTRY = `SELECT source_entry_title FROM backlinks WHERE target_entry_title = ?`
+
 const GET_ENTRIES_FOR_TAG = `SELECT entry_title from entries_tags WHERE tag_name = ?`
 
-export { GET_ENTRY, GET_ALL_ENTRIES, GET_ENTRIES_FOR_TAG }
+
+export { GET_ENTRY, GET_ALL_ENTRIES, GET_BACKLINKS_FOR_ENTRY, GET_OUTLINKS_FOR_ENTRY, GET_ENTRIES_FOR_TAG }