Allow share expiry dates lower than enforced limits

Previously, users could change the share expiry date up
to the enforced maximum.

The new share flow imposed the enforced share expiry
date maximum literally and did not allow even dates
lower than the maximum enforced.

That does not make much sense, if the enforced expiry date is 30
days from creation date, then it's logical to allow users set the
date to anything less than 30 days from the creation date.

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

Author: nfebe

apps/files_sharing/src/views/SharingDetailsTab.vue

@@ -113,11 +113,10 @@
 				</NcCheckboxRadioSwitch>
 				<NcDateTimePickerNative v-if="hasExpirationDate"
 					id="share-date-picker"
-					:value="new Date(share.expireDate)"
+					:value="new Date(share.expireDate ?? dateTomorrow)"
 					:min="dateTomorrow"
-					:max="dateMaxEnforced"
+					:max="maxExpirationDateEnforced"
 					:hide-label="true"
-					:disabled="isExpiryDateEnforced"
 					:placeholder="t('files_sharing', 'Expiration date')"
 					type="date"
 					@input="onExpirationChange" />
@@ -418,11 +417,16 @@ export default {
 		isFolder() {
 			return this.fileInfo.type === 'dir'
 		},
-		dateMaxEnforced() {
-			if (!this.isRemoteShare && this.config.isDefaultInternalExpireDateEnforced) {
-				return new Date(new Date().setDate(new Date().getDate() + 1 + this.config.defaultInternalExpireDate))
-			} else if (this.config.isDefaultRemoteExpireDateEnforced) {
-				return new Date(new Date().setDate(new Date().getDate() + 1 + this.config.defaultRemoteExpireDate))
+		maxExpirationDateEnforced() {
+			if (this.isPublicShare) {
+				return this.config.defaultExpirationDate
+			}
+			if (this.isRemoteShare) {
+				return this.config.defaultRemoteExpirationDateString
+			}
+			// If it get's here then it must be an internal share
+			if (this.isExpiryDateEnforced) {
+				return this.config.defaultInternalExpirationDate
 			}
 			return null
 		},