implemented query language for attributes, closes #26

src/public/stylesheets/style.css

@@ -261,5 +261,5 @@ div.ui-tooltip {
 
 #attribute-list button {
     padding: 2px;
-    margin-right: 10px;
+    margin-right: 5px;
 }

src/routes/api/notes.js

@@ -58,15 +58,112 @@ router.put('/:noteId', auth.checkApiAuth, wrap(async (req, res, next) => {
 }));
 
 router.get('/', auth.checkApiAuth, wrap(async (req, res, next) => {
-    const search = '%' + utils.sanitizeSql(req.query.search) + '%';
+    let {attrFilters, searchText} = parseFilters(req.query.search);
 
-    // searching in protected notes is pointless because of encryption
-    const noteIds = await sql.getColumn(`SELECT noteId FROM notes 
-              WHERE isDeleted = 0 AND isProtected = 0 AND (title LIKE ? OR content LIKE ?)`, [search, search]);
+    const {query, params} = getSearchQuery(attrFilters, searchText);
+
+    const noteIds = await sql.getColumn(query, params);
 
     res.send(noteIds);
 }));
 
+function parseFilters(searchText) {
+    const attrFilters = [];
+
+    const attrRegex = /(\b(and|or)\s+)?@(!?)([\w_-]+|"[^"]+")((=|!=|<|<=|>|>=)([\w_-]+|"[^"]+"))?/i;
+
+    let match = attrRegex.exec(searchText);
+
+    function trimQuotes(str) { return str.startsWith('"') ? str.substr(1, str.length - 2) : str; }
+
+    while (match != null) {
+        const relation = match[2] !== undefined ? match[2].toLowerCase() : 'and';
+        const operator = match[3] === '!' ? 'not-exists' : 'exists';
+
+        attrFilters.push({
+            relation: relation,
+            name: trimQuotes(match[4]),
+            operator: match[6] !== undefined ? match[6] : operator,
+            value: match[7] !== undefined ? trimQuotes(match[7]) : null
+        });
+
+        // remove attributes from further fulltext search
+        searchText = searchText.replace(new RegExp(match[0], 'g'), '');
+
+        match = attrRegex.exec(searchText);
+    }
+
+    return {attrFilters, searchText};
+}
+
+function getSearchQuery(attrFilters, searchText) {
+    const joins = [];
+    const joinParams = [];
+    let where = '1';
+    const whereParams = [];
+
+    let i = 1;
+
+    for (const filter of attrFilters) {
+        joins.push(`LEFT JOIN attributes AS attr${i} ON attr${i}.noteId = notes.noteId AND attr${i}.name = ?`);
+        joinParams.push(filter.name);
+
+        where += " " + filter.relation + " ";
+
+        if (filter.operator === 'exists') {
+            where += `attr${i}.attributeId IS NOT NULL`;
+        }
+        else if (filter.operator === 'not-exists') {
+            where += `attr${i}.attributeId IS NULL`;
+        }
+        else if (filter.operator === '=' || filter.operator === '!=') {
+            where += `attr${i}.value ${filter.operator} ?`;
+            whereParams.push(filter.value);
+        }
+        else if ([">", ">=", "<", "<="].includes(filter.operator)) {
+            const floatParam = parseFloat(filter.value);
+
+            if (isNaN(floatParam)) {
+                where += `attr${i}.value ${filter.operator} ?`;
+                whereParams.push(filter.value);
+            }
+            else {
+                where += `CAST(attr${i}.value AS DECIMAL) ${filter.operator} ?`;
+                whereParams.push(floatParam);
+            }
+        }
+        else {
+            throw new Error("Unknown operator " + filter.operator);
+        }
+
+        i++;
+    }
+
+    let searchCondition = '';
+    const searchParams = [];
+
+    if (searchText.trim() !== '') {
+        // searching in protected notes is pointless because of encryption
+        searchCondition = ' AND (notes.isProtected = 0 AND (notes.title LIKE ? OR notes.content LIKE ?))';
+
+        searchText = '%' + searchText.trim() + '%';
+
+        searchParams.push(searchText);
+        searchParams.push(searchText); // two occurences in searchCondition
+    }
+
+    const query = `SELECT notes.noteId FROM notes
+            ${joins.join('\r\n')}
+              WHERE 
+                notes.isDeleted = 0
+                AND (${where}) 
+                ${searchCondition}`;
+
+    const params = joinParams.concat(whereParams).concat(searchParams);
+
+    return { query, params };
+}
+
 router.put('/:noteId/sort', auth.checkApiAuth, wrap(async (req, res, next) => {
     const noteId = req.params.noteId;
     const sourceId = req.headers.source_id;

src/views/index.ejs

@@ -58,12 +58,11 @@
         </div>
 
         <div id="search-box" style="display: none; padding: 10px; margin-top: 10px;">
-          <p>
+          <div style="display: flex; align-items: center;">
             <label>Search:</label>
-            <input name="search-text" autocomplete="off">
-            <button id="reset-search-button">&times;</button>
-            <span id="matches"></span>
-          </p>
+            <input name="search-text" style="flex-grow: 100; margin-left: 5px; margin-right: 5px;" autocomplete="off">
+            <button id="reset-search-button" class="btn btn-sm" title="Reset search">&times;</button>
+          </div>
         </div>
       </div>
 
@@ -145,7 +144,7 @@
       </div>
 
       <div id="attribute-list">
-        <button class="btn-default btn-sm" onclick="attributesDialog.showDialog();">Attributes:</button>
+        <button class="btn btn-sm" onclick="attributesDialog.showDialog();">Attributes:</button>
 
         <span id="attribute-list-inner"></span>
       </div>