feat: change url structure to use short ids instead of full uuids

migrations/0069_add-short_id-to-tasks-and-projects.up.sql

@@ -0,0 +1,68 @@
+CREATE OR REPLACE FUNCTION unique_short_id()
+RETURNS TRIGGER AS $$
+
+ -- Declare the variables we'll be using.
+DECLARE
+  key TEXT;
+  qry TEXT;
+  found TEXT;
+BEGIN
+
+  -- generate the first part of a query as a string with safely
+  -- escaped table name, using || to concat the parts
+  qry := 'SELECT short_id FROM ' || quote_ident(TG_TABLE_NAME) || ' WHERE short_id=';
+
+  -- This loop will probably only run once per call until we've generated
+  -- millions of ids.
+  LOOP
+
+    -- Generate our string bytes and re-encode as a base64 string.
+    key := encode(gen_random_bytes(6), 'base64');
+
+    -- Base64 encoding contains 2 URL unsafe characters by default.
+    -- The URL-safe version has these replacements.
+    key := replace(key, '/', '_'); -- url safe replacement
+    key := replace(key, '+', '-'); -- url safe replacement
+
+    -- Concat the generated key (safely quoted) with the generated query
+    -- and run it.
+    -- SELECT id FROM "test" WHERE id='blahblah' INTO found
+    -- Now "found" will be the duplicated id or NULL.
+    EXECUTE qry || quote_literal(key) INTO found;
+
+    -- Check to see if found is NULL.
+    -- If we checked to see if found = NULL it would always be FALSE
+    -- because (NULL = NULL) is always FALSE.
+    IF found IS NULL THEN
+
+      -- If we didn't find a collision then leave the LOOP.
+      EXIT;
+    END IF;
+
+    -- We haven't EXITed yet, so return to the top of the LOOP
+    -- and try again.
+  END LOOP;
+
+  -- NEW and OLD are available in TRIGGER PROCEDURES.
+  -- NEW is the mutated row that will actually be INSERTed.
+  -- We're replacing id, regardless of what it was before
+  -- with our key variable.
+  NEW.short_id = key;
+
+  -- The RECORD returned here is what will actually be INSERTed,
+  -- or what the next trigger will get if there is one.
+  RETURN NEW;
+END;
+$$ language 'plpgsql';
+
+ALTER TABLE project ADD COLUMN short_id text UNIQUE;
+UPDATE project SET short_id = encode(gen_random_bytes(6), 'base64');
+ALTER TABLE project ALTER COLUMN short_id SET NOT NULL;
+ALTER TABLE project ADD CONSTRAINT project_short_id_unique UNIQUE (short_id);
+CREATE TRIGGER trigger_project_short_id BEFORE INSERT ON project FOR EACH ROW EXECUTE PROCEDURE unique_short_id();
+
+ALTER TABLE task ADD COLUMN short_id text UNIQUE;
+UPDATE task SET short_id = encode(gen_random_bytes(6), 'base64');
+ALTER TABLE task ALTER COLUMN short_id SET NOT NULL;
+ALTER TABLE task ADD CONSTRAINT task_short_id_unique UNIQUE (short_id);
+CREATE TRIGGER trigger_task_short_id BEFORE INSERT ON task FOR EACH ROW EXECUTE PROCEDURE unique_short_id();