/**
* Get the container which security callback affects this item. This searches up the path of
* parents to see wether it can find any container with a callback. If no callback can be found,
* null is returned.
*
* @param vfsItem
* @return
*/
public static VFSContainer findInheritingSecurityCallbackContainer(VFSItem vfsItem) {
if (vfsItem == null) return null;
// first resolve delegates of any NamedContainers to get the actual container (might be a
// MergeSource)
if (vfsItem instanceof NamedContainerImpl)
return findInheritingSecurityCallbackContainer(((NamedContainerImpl) vfsItem).getDelegate());
// special treatment for MergeSource
if (vfsItem instanceof MergeSource) {
MergeSource mergeSource = (MergeSource) vfsItem;
VFSContainer rootWriteContainer = mergeSource.getRootWriteContainer();
if (rootWriteContainer != null && rootWriteContainer.getLocalSecurityCallback() != null) {
// if the root write container has a security callback set, it will always override
// any local securitycallback set on the mergesource
return rootWriteContainer;
} else if (mergeSource.getLocalSecurityCallback() != null) {
return mergeSource;
} else if (mergeSource.getParentContainer() != null) {
return findInheritingSecurityCallbackContainer(mergeSource.getParentContainer());
}
} else {
if ((vfsItem instanceof VFSContainer) && (vfsItem.getLocalSecurityCallback() != null))
return (VFSContainer) vfsItem;
if (vfsItem.getParentContainer() != null)
return findInheritingSecurityCallbackContainer(vfsItem.getParentContainer());
}
return null;
}
/**
* Check if the file exist or not
*
* @param item
* @return
*/
public static boolean exists(VFSItem item) {
if (item instanceof NamedContainerImpl) {
item = ((NamedContainerImpl) item).getDelegate();
}
if (item instanceof MergeSource) {
MergeSource source = (MergeSource) item;
item = source.getRootWriteContainer();
if (item == null) {
// no write container, but the virtual container exist
return true;
}
}
if (item instanceof LocalImpl) {
LocalImpl localFile = (LocalImpl) item;
return localFile.getBasefile() != null && localFile.getBasefile().exists();
}
return false;
}
private static ContainerAndFile findWritableRootFolderForRecursion(
VFSContainer rootDir, String relFilePath, int recursionLevel) {
recursionLevel++;
if (recursionLevel > 20) {
// Emergency exit condition: a directory hierarchy that has more than 20
// levels? Probably not..
log.warn(
"Reached recursion level while finding writable root Folder - most likely a bug. rootDir::"
+ rootDir
+ " relFilePath::"
+ relFilePath);
return null;
}
if (rootDir instanceof NamedContainerImpl) {
rootDir = ((NamedContainerImpl) rootDir).getDelegate();
}
if (rootDir instanceof MergeSource) {
MergeSource mergedDir = (MergeSource) rootDir;
// first check if the next level is not a second MergeSource
int stop = relFilePath.indexOf("/", 1);
if (stop > 0) {
String nextLevel = extractChild(relFilePath);
VFSItem item = mergedDir.resolve(nextLevel);
if (item instanceof NamedContainerImpl) {
item = ((NamedContainerImpl) item).getDelegate();
}
if (item instanceof MergeSource) {
rootDir = (MergeSource) item;
relFilePath = relFilePath.substring(stop);
return findWritableRootFolderForRecursion(rootDir, relFilePath, recursionLevel);
}
}
VFSContainer rootWriteContainer = mergedDir.getRootWriteContainer();
if (rootWriteContainer == null) {
// we have a merge source without a write container, try it one higher,
// go through all children of this one and search the correct child in
// the path
List<VFSItem> children = rootDir.getItems();
if (children.isEmpty()) {
// ups, a merge source without children, no good, return null
return null;
}
String nextChildName = relFilePath.substring(1, relFilePath.indexOf("/", 1));
for (VFSItem child : children) {
// look up for the next child in the path
if (child.getName().equals(nextChildName)) {
// use this child as new root and remove the child name from the rel
// path
if (child instanceof VFSContainer) {
rootDir = (VFSContainer) child;
relFilePath = relFilePath.substring(relFilePath.indexOf("/", 1));
break;
} else {
// ups, a merge source with a child that is not a VFSContainer -
// no good, return null
return null;
}
}
}
} else {
// ok, we found a merge source with a write container
rootDir = rootWriteContainer;
}
}
if (rootDir != null && rootDir instanceof LocalFolderImpl) {
// finished, we found a local folder we can use to write
return new ContainerAndFile(rootDir, relFilePath);
} else {
// do recursion
return findWritableRootFolderForRecursion(rootDir, relFilePath, recursionLevel);
}
}
/**
* Get the path as string of the given item relative to the root container and the relative base
* path
*
* @param item the item for which the relative path should be returned
* @param rootContainer The root container for which the relative path should be calculated
* @param relativeBasePath when NULL, the path will be calculated relative to the rootContainer;
* when NOT NULL, the relativeBasePath must represent a relative path within the root
* container that serves as the base. In this case, the calculated relative item path will
* start from this relativeBasePath
* @return
*/
public static String getRelativeItemPath(
VFSItem item, VFSContainer rootContainer, String relativeBasePath) {
// 1) Create path absolute to the root container
if (item == null) return null;
String absPath = "";
VFSItem tmpItem = item;
// Check for merged containers to fix problems with named containers, see OLAT-3848
List<NamedContainerImpl> namedRootChilds = new ArrayList<NamedContainerImpl>();
for (VFSItem rootItem : rootContainer.getItems()) {
if (rootItem instanceof NamedContainerImpl) {
namedRootChilds.add((NamedContainerImpl) rootItem);
}
}
// Check if root container is the same as the item and vice versa. It is
// necessary to perform the check on both containers to catch all potential
// cases with MergedSource and NamedContainer where the check in one
// direction is not necessarily the same as the opposite check
while (tmpItem != null && !rootContainer.isSame(tmpItem) && !tmpItem.isSame(rootContainer)) {
String itemFileName = tmpItem.getName();
// fxdiff FXOLAT-125: virtual file system for CP
if (tmpItem instanceof NamedLeaf) {
itemFileName = ((NamedLeaf) tmpItem).getDelegate().getName();
}
// Special case: check if this is a named container, see OLAT-3848
for (NamedContainerImpl namedRootChild : namedRootChilds) {
if (namedRootChild.isSame(tmpItem)) {
itemFileName = namedRootChild.getName();
}
}
absPath = "/" + itemFileName + absPath;
tmpItem = tmpItem.getParentContainer();
if (tmpItem != null) {
// test if this this is a merge source child container, see OLAT-5726
VFSContainer grandParent = tmpItem.getParentContainer();
if (grandParent instanceof MergeSource) {
MergeSource mergeGrandParent = (MergeSource) grandParent;
if (mergeGrandParent.isContainersChild((VFSContainer) tmpItem)) {
// skip this parent container and use the merge grand-parent
// instead, otherwise path contains the container twice
tmpItem = mergeGrandParent;
}
}
}
}
if (relativeBasePath == null) {
return absPath;
}
// 2) Compute rel path to base dir of the current file
// selpath = /a/irwas/subsub/nochsub/note.html 5
// filenam = /a/irwas/index.html 3
// --> subsub/nochsub/note.gif
// or /a/irwas/bla/index.html
// to /a/other/b/gugus.gif
// --> ../../ other/b/gugus.gif
// or /a/other/b/main.html
// to /a/irwas/bla/goto.html
// --> ../../ other/b/gugus.gif
String base = relativeBasePath; // assume "/" is here
if (!(base.indexOf("/") == 0)) {
base = "/" + base;
}
String[] baseA = base.split("/");
String[] targetA = absPath.split("/");
int sp = 1;
for (; sp < Math.min(baseA.length, targetA.length); sp++) {
if (!baseA[sp].equals(targetA[sp])) {
break;
}
}
// special case: self-reference
if (absPath.equals(base)) {
sp = 1;
}
StringBuilder buffer = new StringBuilder();
for (int i = sp; i < baseA.length - 1; i++) {
buffer.append("../");
}
for (int i = sp; i < targetA.length; i++) {
buffer.append(targetA[i] + "/");
}
buffer.deleteCharAt(buffer.length() - 1);
String path = buffer.toString();
String trimmed = path; // selectedPath.substring(1);
return trimmed;
}
