Created
March 13, 2017 22:04
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StorageQuota polyfill
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| // MIT License, Copyright William Hilton <wmhilton@gmail.com> | |
| // Implement the proposed W3C Quota Management API (circa 2017) | |
| navigator.storageQuota = { | |
| get supportedTypes () { | |
| let types = [] | |
| if (navigator.webkitTemporaryStorage) types.push('temporary') | |
| if (navigator.webkitPersistentStorage) types.push('persistent') | |
| return types | |
| }, | |
| queryInfo (type) { | |
| return new Promise((resolve, reject) => { | |
| // feature detect Chrome | |
| if (navigator.webkitTemporaryStorage || navigator.webkitPersistentStorage) { | |
| let success = (usage, quota) => resolve({usage, quota}) | |
| let failure = (e) => reject(e) | |
| if (type === 'temporary') { | |
| return navigator.webkitTemporaryStorage.queryUsageAndQuota(success, failure) | |
| } else if (type === 'persistent') { | |
| return navigator.webkitPersistentStorage.queryUsageAndQuota(success, failure) | |
| } | |
| } else { | |
| // Hopefully firefox and others? | |
| } | |
| }) | |
| }, | |
| requestPersistentQuota (newQuota) { | |
| return new Promise((resolve, reject) => { | |
| // feature detect Chrome | |
| if (navigator.webkitPersistentStorage) { | |
| let success = (usage, quota) => resolve({usage, quota}) | |
| let failure = (e) => reject(e) | |
| navigator.webkitPersistentStorage.requestQuota(newQuota, function (grantedBytes) { | |
| // to be API compliant, we need to return 'usage' here too, and requestQuota only returns granted, | |
| // so we have to do a second call to return both values | |
| return navigator.webkitPersistentStorage.queryUsageAndQuota(success, failure) | |
| }) | |
| } else { | |
| // Hopefully firefox and others? | |
| } | |
| }) | |
| } | |
| } |
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