Content server: Implement the "Copy to library" function. To use it click the three dots in the top right corner of a book's page and choose "Copy to library". Fixes #1810486 [[Feature] Copy to another library on the server](https://bugs.launchpad.net/calibre/+bug/1810486)

src/calibre/srv/cdb.py

@@ -124,24 +124,28 @@ def cdb_set_cover(ctx, rd, book_id, library_id):
     return tuple(dirtied)
 
 
+def load_payload_data(rd):
+    raw = rd.read()
+    ct = rd.inheaders.get('Content-Type', all=True)
+    ct = {x.lower().partition(';')[0] for x in ct}
+    try:
+        if MSGPACK_MIME in ct:
+            return msgpack_loads(raw)
+        elif 'application/json' in ct:
+            return json_loads(raw)
+        else:
+            raise HTTPBadRequest('Only JSON or msgpack requests are supported')
+    except Exception:
+        raise HTTPBadRequest('Invalid encoded data')
+
+
 @endpoint('/cdb/set-fields/{book_id}/{library_id=None}', types={'book_id': int},
           needs_db_write=True, postprocess=msgpack_or_json, methods=receive_data_methods, cache_control='no-cache')
 def cdb_set_fields(ctx, rd, book_id, library_id):
     db = get_db(ctx, rd, library_id)
     if ctx.restriction_for(rd, db):
         raise HTTPForbidden('Cannot use the set fields interface with a user who has per library restrictions')
-    raw = rd.read()
-    ct = rd.inheaders.get('Content-Type', all=True)
-    ct = {x.lower().partition(';')[0] for x in ct}
-    try:
-        if MSGPACK_MIME in ct:
-            data = msgpack_loads(raw)
-        elif 'application/json' in ct:
-            data = json_loads(raw)
-        else:
-            raise HTTPBadRequest('Only JSON or msgpack requests are supported')
-    except Exception:
-        raise HTTPBadRequest('Invalid encoded data')
+    data = load_payload_data(rd)
     try:
         changes, loaded_book_ids = data['changes'], frozenset(map(int, data.get('loaded_book_ids', ())))
         all_dirtied = bool(data.get('all_dirtied'))
@@ -172,3 +176,47 @@ def cdb_set_fields(ctx, rd, book_id, library_id):
     all_ids = dirtied if all_dirtied else (dirtied & loaded_book_ids)
     all_ids |= {book_id}
     return {bid: book_as_json(db, book_id) for bid in all_ids}
+
+
+@endpoint('/cdb/copy-to-library/{target_library_id}/{library_id=None}', needs_db_write=True,
+        postprocess=msgpack_or_json, methods=receive_data_methods, cache_control='no-cache')
+def cdb_copy_to_library(ctx, rd, target_library_id, library_id):
+    db_src = get_db(ctx, rd, library_id)
+    db_dest = get_db(ctx, rd, target_library_id)
+    if ctx.restriction_for(rd, db_src) or ctx.restriction_for(rd, db_dest):
+        raise HTTPForbidden('Cannot use the copy to library interface with a user who has per library restrictions')
+    data = load_payload_data(rd)
+    try:
+        book_ids = {int(x) for x in data['book_ids']}
+        move_books = bool(data.get('move', False))
+        preserve_date = bool(data.get('preserve_date', True))
+        duplicate_action = data.get('duplicate_action') or 'add'
+        automerge_action = data.get('automerge_action') or 'overwrite'
+    except Exception:
+        raise HTTPBadRequest('Invalid encoded data, must be of the form: {book_ids: [id1, id2, ..]}')
+    if duplicate_action not in ('add', 'add_formats_to_existing'):
+        raise HTTPBadRequest('duplicate_action must be one of: add, add_formats_to_existing')
+    if automerge_action not in ('overwrite', 'ignore', 'new record'):
+        raise HTTPBadRequest('automerge_action must be one of: overwrite, ignore, new record')
+    response = {}
+    identical_books_data = None
+    if duplicate_action != 'add':
+        identical_books_data = db_dest.data_for_find_identical_books()
+    to_remove = set()
+    from calibre.db.copy_to_library import copy_one_book
+    for book_id in book_ids:
+        try:
+            rdata = copy_one_book(
+                    book_id, db_src, db_dest, duplicate_action=duplicate_action, automerge_action=automerge_action,
+                    preserve_uuid=move_books, preserve_date=preserve_date, identical_books_data=identical_books_data)
+            if move_books:
+                to_remove.add(book_id)
+            response[book_id] = {'ok': True, 'payload': rdata}
+        except Exception:
+            import traceback
+            response[book_id] = {'ok': False, 'payload': traceback.format_exc()}
+
+    if to_remove:
+        db_src.remove_books(to_remove, permanent=True)
+
+    return response

src/pyj/book_list/book_details.pyj

@@ -6,13 +6,14 @@ import traceback
 from elementmaker import E
 from gettext import gettext as _
 
-from ajax import ajax, encode_query_component
-from book_list.delete_book import start_delete_book
+from ajax import ajax, ajax_send, encode_query_component
+from book_list.delete_book import refresh_after_delete, start_delete_book
 from book_list.globals import get_session_data
 from book_list.item_list import create_item, create_item_list
 from book_list.library_data import (
-    book_metadata, cover_url, current_library_id, current_virtual_library,
-    download_url, library_data, load_status, set_book_metadata
+    all_libraries, book_metadata, cover_url, current_library_id,
+    current_virtual_library, download_url, library_data, load_status,
+    set_book_metadata
 )
 from book_list.router import back, home, open_book, report_a_load_failure
 from book_list.theme import get_color, get_font_size
@@ -20,8 +21,8 @@ from book_list.top_bar import add_button, clear_buttons, create_top_bar, set_tit
 from book_list.ui import query_as_href, set_panel_handler, show_panel
 from book_list.views import search_query_for
 from date import format_date
-from dom import add_extra_css, build_rule, clear, svgicon
-from modals import create_custom_dialog, error_dialog
+from dom import add_extra_css, build_rule, clear, ensure_id, svgicon
+from modals import create_custom_dialog, error_dialog, warning_dialog
 from session import get_interface_data
 from utils import (
     conditional_timeout, debounce, fmt_sidx, human_readable, parse_url_params,
@@ -33,6 +34,7 @@ bd_counter = 0
 
 CLASS_NAME = 'book-details-panel'
 SEARCH_INTERNET_CLASS = 'book-details-search-internet'
+COPY_TO_LIBRARY_CLASS = 'book-details-copy-to-library'
 FORMAT_PRIORITIES = [
     'EPUB', 'AZW3', 'DOCX', 'LIT', 'MOBI', 'ODT', 'RTF', 'MD', 'MARKDOWN', 'TXT', 'PDF'
 ]
@@ -384,6 +386,9 @@ add_extra_css(def():
     style += build_rule(sel, margin='1ex 1em')
     style += build_rule(sel + ' ul > li', list_style_type='none')
     style += build_rule(sel + ' ul > li > a', padding='2ex 1em', display='block', width='100%')
+
+    sel = '.' + COPY_TO_LIBRARY_CLASS
+    style += build_rule(sel, margin='1ex 1em')
     return style
 )
 
@@ -611,7 +616,13 @@ def create_more_actions_panel(container_id):
                     action=def():
                         show_subsequent_panel('search_internet', replace=True)
         ),
+
         create_item(title, subtitle=subtitle, action=toggle_fields),
+
+        create_item(_('Copy to library'), subtitle=_('Copy or move this book to another calibre library'),
+                    action=def():
+                        show_subsequent_panel('copy_to_library', replace=True)
+        ),
     ]
     container.appendChild(E.div())
     create_item_list(container.lastChild, items)
@@ -663,9 +674,99 @@ def search_internet(container_id):
     ))
 
 
+def do_copy_to_library(book_id, target_library_id, target_library_name):
+
+    def handle_result(move, close_func, end_type, xhr, ev):
+        close_func()
+        title = book_metadata(book_id).title
+        return_to_book_details()
+        if end_type is 'abort':
+            return
+        if end_type is not 'load':
+            error_dialog(_('Failed to copy book'), _(
+                'Failed to copy the book "{}" click "Show details" for more information.').format(title),
+                xhr.error_html)
+            return
+        try:
+            response = JSON.parse(xhr.responseText)[book_id]
+            if not response:
+                raise Exception('bad')
+        except:
+            error_dialog(_('Failed to copy book'), _(
+                'Failed to copy the book "{}" got an invalid response from calibre').format(title))
+            return
+        if not response.ok:
+            error_dialog(_('Failed to copy book'), _(
+                'Failed to copy the book "{}" click "Show details" for more information.').format(title),
+                response.payload
+            )
+            return
+        if response.action is 'duplicate':
+            warning_dialog(_('Book already exists'), _(
+                'Could not copy as a book with the same title and authors already exists in the {} library').format(target_library_name))
+
+        elif response.action is 'automerge':
+            warning_dialog(_('Book merged'), _(
+                'The files from the book were merged into a book with the same title and authors in the {} library').format(target_library_name))
+        if move:
+            refresh_after_delete(book_id, current_library_id())
+
+
+    def trigger_copy(container_id, move, close_func):
+        data = {'book_ids':v'[book_id]', 'move': move}
+        container = document.getElementById(container_id)
+        clear(container)
+        container.appendChild(E.div(
+            _('Contacting calibre to copy book, please wait...')))
+        ajax_send(f'cdb/copy-to-library/{target_library_id}/{current_library_id()}',
+                  data, handle_result.bind(None, move, close_func))
+
+    create_custom_dialog(_('Copy to library'), def (container, close_func):
+        mi = book_metadata(book_id)
+        container_id = ensure_id(container)
+        container.appendChild(E.div(
+            E.div(_(
+                'Copy "{title}" to the library "{target_library_name}"?').format(
+                    title=mi.title, target_library_name=target_library_name)
+            ),
+            E.div(
+                class_='button-box',
+                create_button(_('Copy'), None, trigger_copy.bind(None, container_id, False, close_func), highlight=True),
+                '\xa0',
+                create_button(_('Move'), None, trigger_copy.bind(None, container_id, True, close_func)),
+                '\xa0',
+                create_button(_('Cancel'), None, close_func),
+            )
+        ))
+    )
+
+
+def copy_to_library(container_id):
+    if not render_book.book_id or not book_metadata(render_book.book_id):
+        return return_to_book_details()
+    container = document.getElementById(container_id)
+    create_top_bar(container, title=_('Copy to library'), action=back, icon='close')
+    libraries = all_libraries()
+    container.appendChild(E.div(class_=COPY_TO_LIBRARY_CLASS))
+    container = container.lastChild
+    if libraries.length < 2:
+        container.appendChild(E.div(_('There are no other calibre libraries available to copy the book to')))
+        return
+    container.appendChild(E.h2(_('Choose the library to copy to below')))
+    items = []
+    for library_id, library_name in libraries:
+        if library_id is current_library_id():
+            continue
+        items.push(create_item(library_name, action=do_copy_to_library.bind(None, render_book.book_id, library_id, library_name)))
+    container.appendChild(E.div())
+    create_item_list(container.lastChild, items)
+
+
+
 def delete_book():
     start_delete_book(current_library_id(), render_book.book_id, render_book.title or _('Unknown'))
 
 set_panel_handler('book_details', init)
 set_panel_handler('book_details^more_actions', create_more_actions_panel)
 set_panel_handler('book_details^search_internet', search_internet)
+set_panel_handler('book_details^copy_to_library', copy_to_library)

src/pyj/book_list/delete_book.pyj

@@ -22,6 +22,15 @@ def delete_from_cache(library_id, book_id, title):
     db.delete_books_matching(library_id, book_id)
 
 
+def refresh_after_delete(book_id, library_id):
+    force_refresh_on_next_load()
+    next_book_id = book_after(book_id)
+    if next_book_id:
+        show_panel('book_details', {'book_id': str(next_book_id), 'library_id': library_id}, True)
+    else:
+        back()
+
+
 def do_delete_from_library(parent, close_modal, library_id, book_id, title):
     parent.appendChild(E.div(_('Deleting {0} from library, please wait...').format(title)))
 
@@ -29,12 +38,7 @@ def do_delete_from_library(parent, close_modal, library_id, book_id, title):
         if end_type is 'load' or end_type is 'abort':
             close_modal()
             if end_type is 'load':
-                force_refresh_on_next_load()
-                next_book_id = book_after(book_id)
-                if next_book_id:
-                    show_panel('book_details', {'book_id': str(next_book_id), 'library_id': library_id}, True)
-                else:
-                    back()
+                refresh_after_delete(book_id, library_id)
             return
         clear(parent)
         msg = E.div()

src/pyj/book_list/home.pyj

@@ -9,7 +9,7 @@ from ajax import ajax_send
 from book_list.constants import has_offline_support
 from book_list.cover_grid import BORDER_RADIUS
 from book_list.globals import get_db
-from book_list.library_data import last_virtual_library_for, sync_library_books
+from book_list.library_data import last_virtual_library_for, sync_library_books, all_libraries
 from book_list.router import open_book, update_window_title
 from book_list.top_bar import add_button, create_top_bar
 from book_list.ui import set_default_panel_handler, show_panel
@@ -241,8 +241,7 @@ def init(container_id):
     container.appendChild(E.h2(_('Choose the calibre library to browse…')))
     container.appendChild(E.div(style='display: flex; flex-wrap: wrap'))
     cl = container.lastChild
-    lids = sorted(interface_data.library_map, key=def(x): return interface_data.library_map[x];)
-    for library_id in lids:
+    for library_id, library_name in all_libraries():
         library_name = interface_data.library_map[library_id]
         if library_name:
             cl.appendChild(

src/pyj/book_list/library_data.pyj

@@ -19,6 +19,12 @@ def current_library_id():
     return q.library_id or get_interface_data().default_library_id
 
 
+def all_libraries():
+    interface_data = get_interface_data()
+    lids = sorted(interface_data.library_map, key=def(x): return interface_data.library_map[x];)
+    return [(lid, interface_data.library_map[lid]) for lid in lids]
+
+
 def current_virtual_library():
     q = parse_url_params()
     return q.vl or ''