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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 | 64x 18x 18x 18x 44x 40x 4x 4x 2x 4x | import {
type MultipartUploadContext,
type MultipartUploadResumeState,
RESUMABLE_UPLOAD_STORAGE_VERSION,
type UploadFileFingerprint,
} from "./types";
function isBrowserStorageAvailable(): boolean {
return (
typeof window !== "undefined" && typeof window.localStorage !== "undefined"
);
}
/** Build the stable browser-side fingerprint used to validate resume candidates. */
export function getFileFingerprint(file: File): UploadFileFingerprint {
return {
name: file.name,
size: file.size,
lastModified: file.lastModified,
type: file.type,
};
}
/** Create the persisted resume payload for an in-progress or already-uploaded CSV. */
export function createResumeState(
context: MultipartUploadContext,
file: File,
uploadSessionId: string,
uploadPhase: MultipartUploadResumeState["upload_phase"],
): MultipartUploadResumeState {
return {
version: RESUMABLE_UPLOAD_STORAGE_VERSION,
upload_session_id: uploadSessionId,
upload_phase: uploadPhase,
file: getFileFingerprint(file),
original_filename: file.name,
content_type: file.type || "text/csv",
...context,
};
}
/** Persist resumable upload state when browser storage is available. */
export function saveResumeState(
key: string,
state: MultipartUploadResumeState,
): void {
if (!isBrowserStorageAvailable()) {
return;
}
window.localStorage.setItem(key, JSON.stringify(state));
}
/** Load resumable upload state and reject anything that no longer matches the schema. */
export function loadResumeState(
key: string,
): MultipartUploadResumeState | null {
if (!isBrowserStorageAvailable()) {
return null;
}
const rawValue = window.localStorage.getItem(key);
if (!rawValue) {
return null;
}
try {
const parsed = JSON.parse(rawValue) as Partial<MultipartUploadResumeState>;
if (
parsed.version !== RESUMABLE_UPLOAD_STORAGE_VERSION ||
typeof parsed.upload_session_id !== "string" ||
!parsed.file ||
typeof parsed.file.name !== "string" ||
typeof parsed.file.size !== "number" ||
typeof parsed.file.lastModified !== "number"
) {
return null;
}
return parsed as MultipartUploadResumeState;
} catch {
return null;
}
}
/** Remove the persisted resume payload for the provided upload key. */
export function clearResumeState(key: string): void {
if (!isBrowserStorageAvailable()) {
return;
}
window.localStorage.removeItem(key);
}
/** Ensure persisted resume state still belongs to the active flowsheet/upload context. */
export function resumeStateMatchesContext(
state: MultipartUploadResumeState,
context: MultipartUploadContext,
): boolean {
return (
state.purpose === context.purpose &&
state.flowsheet_id === context.flowsheet_id &&
state.scenario_id === context.scenario_id &&
state.simulationObject_id === context.simulationObject_id
);
}
/** Ensure the user re-selected the exact same local file before resuming an upload. */
export function resumeStateMatchesFile(
state: MultipartUploadResumeState,
file: File,
): boolean {
const fingerprint = getFileFingerprint(file);
return (
state.file.name === fingerprint.name &&
state.file.size === fingerprint.size &&
state.file.lastModified === fingerprint.lastModified
);
}
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