migrate filtering expressions to safer CEL and add a query builder

commafeed-client/src/components/content/edit/FilteringExpressionEditor.tsx

@@ -0,0 +1,118 @@
+import { Stack } from "@mantine/core"
+import { MantineValueSelector, QueryBuilderMantine } from "@react-querybuilder/mantine"
+import {
+    type CombinatorSelectorProps,
+    defaultOperators,
+    defaultRuleProcessorCEL,
+    type Field,
+    type FormatQueryOptions,
+    formatQuery,
+    QueryBuilder,
+    type RuleGroupType,
+} from "react-querybuilder"
+import { isCELIdentifier, isCELMember, isCELStringLiteral, parseCEL } from "react-querybuilder/parseCEL"
+import "react-querybuilder/dist/query-builder.css"
+
+const fields: Field[] = [
+    { name: "title", label: "Title" },
+    { name: "content", label: "Content" },
+    { name: "url", label: "URL" },
+    { name: "author", label: "Author" },
+    { name: "categories", label: "Categories" },
+    { name: "titleLower", label: "Title (lower case)" },
+    { name: "contentLower", label: "Content (lower case)" },
+    { name: "urlLower", label: "URL  (lower case)" },
+    { name: "authorLower", label: "Author (lower case)" },
+    { name: "categoriesLower", label: "Categories (lower case)" },
+]
+
+const textOperators = new Set(["=", "!=", "contains", "beginsWith", "endsWith", "doesNotContain", "doesNotBeginWith", "doesNotEndWith"])
+
+function toCelString(query: RuleGroupType): string {
+    if (query.rules.length === 0) {
+        return ""
+    }
+
+    const celFormatOptions: FormatQueryOptions = {
+        format: "cel",
+        ruleProcessor: (rule, options, meta) => {
+            if (rule.operator === "matches") {
+                const escapedValue = String(rule.value).replaceAll("\\", "\\\\").replaceAll('"', String.raw`\"`)
+                return `${rule.field}.matches("${escapedValue}")`
+            }
+
+            return defaultRuleProcessorCEL(rule, options, meta)
+        },
+    }
+
+    return formatQuery(query, celFormatOptions)
+}
+
+function fromCelString(celString: string): RuleGroupType {
+    return parseCEL(celString ?? "", {
+        customExpressionHandler: expr => {
+            if (
+                isCELMember(expr) &&
+                expr.right?.value === "matches" &&
+                expr.left &&
+                isCELIdentifier(expr.left) &&
+                expr.list &&
+                isCELStringLiteral(expr.list.value[0])
+            ) {
+                return {
+                    field: expr.left.value,
+                    operator: "matches",
+                    value: JSON.parse(expr.list.value[0].value),
+                }
+            }
+
+            return null
+        },
+    })
+}
+
+const getOperators = () => {
+    const filteredDefault = defaultOperators.filter(op => textOperators.has(op.name))
+    return [
+        ...filteredDefault,
+        {
+            name: "matches",
+            label: "matches pattern",
+        },
+    ]
+}
+
+function CombinatorSelector(props: Readonly<CombinatorSelectorProps>) {
+    if (props.rules.length === 0) {
+        return null
+    }
+    return <MantineValueSelector {...props} />
+}
+
+interface FilteringExpressionEditorProps {
+    initialValue: string | undefined
+    onChange: (value: string) => void
+}
+
+export function FilteringExpressionEditor({ initialValue, onChange }: Readonly<FilteringExpressionEditorProps>) {
+    const handleQueryChange = (newQuery: RuleGroupType) => {
+        onChange(toCelString(newQuery))
+    }
+
+    return (
+        <Stack gap="sm">
+            <QueryBuilderMantine>
+                <QueryBuilder
+                    fields={fields}
+                    defaultQuery={fromCelString(initialValue ?? "")}
+                    onQueryChange={handleQueryChange}
+                    getOperators={getOperators}
+                    addRuleToNewGroups
+                    resetOnFieldChange={false}
+                    controlClassnames={{ queryBuilder: "queryBuilder-branches" }}
+                    controlElements={{ combinatorSelector: CombinatorSelector }}
+                />
+            </QueryBuilderMantine>
+        </Stack>
+    )
+}