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| 1 | +/** |
| 2 | + * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | + * |
| 4 | + * This source code is licensed under the MIT license found in the |
| 5 | + * LICENSE file in the root directory of this source tree. |
| 6 | + * |
| 7 | + * @flow |
| 8 | + */ |
| 9 | + |
| 10 | +/** |
| 11 | + * Backing FormData is a wrapper around FormData that allows iterating over the |
| 12 | + * keys while allowing to evict values from the FormData without affecting the iteration. |
| 13 | + * Native FormData.keys() will skip keys if entries with Blob are deleted e.g. |
| 14 | + * ```js |
| 15 | + * const formData = new FormData(); |
| 16 | + * formData.append('a', new Blob()); |
| 17 | + * formData.append('b', 2); |
| 18 | + * const keys = formData.keys(); |
| 19 | + * keys.next().value; // 'a' |
| 20 | + * formData.delete('a'); |
| 21 | + * keys.next().value; // undefined, but we expect 'b' |
| 22 | + * ``` |
| 23 | + */ |
| 24 | +exportopaquetypeBackingFormData={ |
| 25 | +data: FormData, |
| 26 | +keyPointer: number, |
| 27 | +// Lazily initialized array of keys. We only need this at the moment |
| 28 | +// for referenced FormData. |
| 29 | +keys: null|Array<string>, |
| 30 | +}; |
| 31 | + |
| 32 | +export functionpeekBackingEntry(backingStore: BackingFormData): string|void{ |
| 33 | +let keys =backingStore.keys; |
| 34 | +if(keys===null){ |
| 35 | + keys =backingStore.keys=Array.from(backingStore.data.keys()); |
| 36 | +backingStore.keyPointer=0; |
| 37 | +} |
| 38 | + |
| 39 | +returnkeys[backingStore.keyPointer]; |
| 40 | +} |
| 41 | + |
| 42 | +exportfunctionadvanceBackingEntryIterator( |
| 43 | +backingStore: BackingFormData, |
| 44 | +): void{ |
| 45 | +backingStore.keyPointer++; |
| 46 | +} |
| 47 | + |
| 48 | +exportfunctionconsumeBackingEntry( |
| 49 | +backingStore: BackingFormData, |
| 50 | +key: string, |
| 51 | +): void{ |
| 52 | +backingStore.data.delete(key); |
| 53 | +backingStore.keyPointer++; |
| 54 | +} |
| 55 | + |
| 56 | +exportfunctionappendBackingEntry( |
| 57 | +backingStore: BackingFormData, |
| 58 | +key: string, |
| 59 | +value: FormDataEntryValue, |
| 60 | +): void{ |
| 61 | +backingStore.data.append(key,value); |
| 62 | +letkeys=backingStore.keys; |
| 63 | +if(keys===null){ |
| 64 | +keys=backingStore.keys=Array.from(backingStore.data.keys()); |
| 65 | +backingStore.keyPointer=0; |
| 66 | +}else{ |
| 67 | +keys.push(key); |
| 68 | +} |
| 69 | +} |
| 70 | + |
| 71 | +exportfunctionappendBackingFile( |
| 72 | +backingStore: BackingFormData, |
| 73 | +key: string, |
| 74 | +value: Blob, |
| 75 | +filename: string, |
| 76 | +): void{ |
| 77 | +backingStore.data.append(key,value,filename); |
| 78 | +letkeys=backingStore.keys; |
| 79 | +if(keys===null){ |
| 80 | +keys=backingStore.keys=Array.from(backingStore.data.keys()); |
| 81 | +backingStore.keyPointer=0; |
| 82 | +}else{ |
| 83 | +keys.push(key); |
| 84 | +} |
| 85 | +} |
| 86 | + |
| 87 | +exportfunctiongetBackingEntry( |
| 88 | +backingStore: BackingFormData, |
| 89 | +key: string, |
| 90 | +): ?FormDataEntryValue{ |
| 91 | +returnbackingStore.data.get(key); |
| 92 | +} |
| 93 | + |
| 94 | +export functiongetAllBackingEntries( |
| 95 | +backingStore: BackingFormData, |
| 96 | +key: string, |
| 97 | +): Array<FormDataEntryValue>{ |
| 98 | +returnbackingStore.data.getAll(key); |
| 99 | +} |
| 100 | + |
| 101 | +exportfunctioncreateBackingFormData(formData: FormData): BackingFormData{ |
| 102 | +return{ |
| 103 | +data: formData, |
| 104 | +keyPointer: -1, |
| 105 | +keys: null, |
| 106 | +}; |
| 107 | +} |
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