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fix(search): chunk long sqlite like terms #37

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fix(search): chunk long sqlite like terms #37

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46 changes: 38 additions & 8 deletions workers/durableObject/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,21 @@ const ALLOWED_SORT_COLUMNS = [

type SortColumn = (typeof ALLOWED_SORT_COLUMNS)[number];

const SQLITE_LIKE_PATTERN_LIMIT = 50;
const LIKE_WILDCARD_PADDING = 2;
const MAX_LIKE_TERM_LENGTH = SQLITE_LIKE_PATTERN_LIMIT - LIKE_WILDCARD_PADDING;

function splitLikeTerm(value: string): string[] {
const trimmed = value.trim();
if (!trimmed) return [];

const chunks: string[] = [];
for (let i = 0; i < trimmed.length; i += MAX_LIKE_TERM_LENGTH) {
chunks.push(trimmed.slice(i, i + MAX_LIKE_TERM_LENGTH));
}
return chunks;
}

/**
* Map SortColumn string names to Drizzle column references for safe
* ORDER BY construction (no string interpolation into SQL).
Expand Down Expand Up @@ -671,20 +686,35 @@ export class MailboxDO extends DurableObject<Env> {
return `?${paramIdx}`;
};

const addLikeConditions = (columns: string[], value: string) => {
for (const term of splitLikeTerm(value)) {
const columnConditions = columns.map(
(column) => `${column} LIKE ${addParam(`%${term}%`)}`,
);
conditions.push(`(${columnConditions.join(" OR ")})`);
}
};

if (query) {
const p1 = addParam(`%${query}%`);
const p2 = addParam(`%${query}%`);
const p3 = addParam(`%${query}%`);
const p4 = addParam(`%${query}%`);
conditions.push(`(${prefix}subject LIKE ${p1} OR ${prefix}body LIKE ${p2} OR ${prefix}sender LIKE ${p3} OR ${prefix}recipient LIKE ${p4} OR ${prefix}cc LIKE ${p4} OR ${prefix}bcc LIKE ${p4})`);
addLikeConditions(
[
`${prefix}subject`,
`${prefix}body`,
`${prefix}sender`,
`${prefix}recipient`,
`${prefix}cc`,
`${prefix}bcc`,
],
query,
);
}
if (folder) {
const p = addParam(folder);
conditions.push(`${prefix}folder_id = (SELECT id FROM folders WHERE name = ${p} OR id = ${p} LIMIT 1)`);
}
if (from) { const p = addParam(`%${from}%`); conditions.push(`${prefix}sender LIKE ${p}`); }
if (to) { const p = addParam(`%${to}%`); conditions.push(`(${prefix}recipient LIKE ${p} OR ${prefix}cc LIKE ${p} OR ${prefix}bcc LIKE ${p})`); }
if (subject) { const p = addParam(`%${subject}%`); conditions.push(`${prefix}subject LIKE ${p}`); }
if (from) addLikeConditions([`${prefix}sender`], from);
if (to) addLikeConditions([`${prefix}recipient`, `${prefix}cc`, `${prefix}bcc`], to);
if (subject) addLikeConditions([`${prefix}subject`], subject);
if (date_start) { const p = addParam(date_start); conditions.push(`${prefix}date >= ${p}`); }
if (date_end) { const p = addParam(date_end); conditions.push(`${prefix}date <= ${p}`); }
if (is_read !== undefined) { const p = addParam(is_read ? 1 : 0); conditions.push(`${prefix}read = ${p}`); }
Expand Down