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Support for prefixes and suffixes #10

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Support for prefixes and suffixes #10

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44 changes: 34 additions & 10 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -276,7 +276,6 @@ module.exports = {
if (options.lambdas && options.lambdas.length) {
const cwd = inventory.inv._project.src;
s3Instance.on('event', (e) => {
console.log('s3rver event', e);
const record = e.Records[0];
const { eventName } = record;
let triggerParts = eventName.split(':');
Expand All @@ -285,12 +284,12 @@ module.exports = {
update.status(`S3 ${triggerEvt}:${triggerApi} event for key ${record.s3.object.key} received!`);
let lambdasToTrigger = [];
options.lambdas.forEach(l => {
Object.keys(l.events).forEach(e => {
let eventParts = e.split(':');
// TODO: prefix and suffix support
Object.entries(l.events).forEach(([event, filters]) => {
let eventParts = event.split(':');
let filterMatches = findFilterMatches({ filters, record });
let evt = eventParts[1]; // i.e. ObjectCreated or ObjectRemoved
let api = eventParts[2]; // i.e. *, Put, Post, Copy
if (evt === triggerEvt && (api === '*' || triggerApi === api)) {
if (evt === triggerEvt && (api === '*' || triggerApi === api) && filterMatches) {
if (!lambdasToTrigger.includes(l)) lambdasToTrigger.push(l);
}
});
Expand Down Expand Up @@ -321,6 +320,27 @@ module.exports = {
opts
};

function findFilterMatches ({ filters, record }) {
// return true if no filters are applied
if (filters.length === 0) {
return true;
}
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const prefixFilter = filters.filter(([key]) => key == 'prefix');
if (prefixFilter.length > 1) {
throw 'More than one prefix is not allowed.';
}
const suffixFilter = filters.filter(([key]) => key == 'suffix');
if (suffixFilter.length > 1) {
throw 'More than one suffix is not allowed.';
}

let prefix = prefixFilter.length < 1 || prefixFilter[0][1] === record.s3.object.key.split('/')[0];
let suffix = suffixFilter.length < 1 || suffixFilter[0][1] === record.s3.object.key.split('.').pop();

return prefix && suffix;
}

function opts (pragma) {
return pragma.reduce((obj, opt) => {
if (Array.isArray(opt)) {
Expand Down Expand Up @@ -348,13 +368,17 @@ function opts (pragma) {
events: {}
};
let props = opt[key];
let lambdaKeys = Object.keys(props);
// If the filter options for an event exist, the props are returned as an array instead of an object.
let hasFilters = Array.isArray(props);
let lambdaKeys = hasFilters ? props : Object.keys(props);
lambdaKeys.forEach(eventName => {
let filterPairs = props[eventName];
lambda.events[eventName] = [];
for (let i = 0; i < filterPairs.length - 1; i++) {
if (i % 2 === 1) continue;
lambda.events[eventName].push([ filterPairs[i], filterPairs[i + 1] ]);
if (!hasFilters) {
let filterPairs = props[eventName];
for (let i = 0; i < filterPairs.length - 1; i++) {
if (i % 2 === 1) continue;
lambda.events[eventName].push([filterPairs[i], filterPairs[i + 1]]);
}
}
});
obj.lambdas.push(lambda);
Expand Down