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 *   Christopher A. Aillon <christopher@aillon.com>
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/* Defines the abstract interface for a principal. */

#include "nsISerializable.idl"

%{C++
struct JSContext;
struct JSPrincipals;
%}

interface nsIURI;

[ptr] native JSContext(JSContext);
[ptr] native JSPrincipals(JSPrincipals);

[uuid(fb9ddeb9-26f9-46b8-85d5-3978aaee05aa)]
interface nsIPrincipal : nsISerializable
{
    /**
     * Values of capabilities for each principal. Order is
     * significant: if an operation is performed on a set
     * of capabilities, the minimum is computed.
     */
    const short ENABLE_DENIED                = 1;
    const short ENABLE_UNKNOWN               = 2;
    const short ENABLE_WITH_USER_PERMISSION  = 3;
    const short ENABLE_GRANTED               = 4;

    /**
     * Returns the security preferences associated with this principal.
     * prefBranch will be set to the pref branch to which these preferences
     * pertain.  id is a pseudo-unique identifier, pertaining to either the
     * fingerprint or the origin.  subjectName is a name that identifies the
     * entity this principal represents (may be empty).  grantedList and
     * deniedList are space-separated lists of capabilities which were
     * explicitly granted or denied by a pref.
     */
    void getPreferences(out string prefBranch, out string id,
                        out string subjectName,
                        out string grantedList, out string deniedList);

    /**
     * Returns whether the other principal is equivalent to this principal.
     * Principals are considered equal if they are the same principal,
     * they have the same origin, or have the same certificate fingerprint ID
     */
    boolean equals(in nsIPrincipal other);

    /**
     * Returns a hash value for the principal.
     */
    readonly attribute unsigned long hashValue;

    /**
     * Returns the JS equivalent of the principal.
     * @see JSPrincipals.h
     */
    JSPrincipals getJSPrincipals(in JSContext cx);

    /**
     * The domain security policy of the principal.
     */
    // XXXcaa should this be here?  The script security manager is the only
    // thing that should care about this.  Wouldn't storing this data in one
    // of the hashtables in nsScriptSecurityManager be better?
    // XXXbz why is this writable?  Who should have write access to this?  What
    // happens if this principal is in our hashtable and we pass it out of the
    // security manager and someone writes to this field?  Especially if they
    // write garbage?  If we need to give someone other than the security
    // manager a way to set this (which I question, since it can increase the
    // permissions of a page) it should be a |void clearSecurityPolicy()|
    // method.
    attribute voidPtr securityPolicy;

    // XXXcaa probably should be turned into {get|set}CapabilityFlags
    // XXXbz again, what if this lives in our hashtable and someone
    // messes with it?  Is that OK?
    short canEnableCapability(in string capability);
    void setCanEnableCapability(in string capability, in short canEnable);
    boolean isCapabilityEnabled(in string capability, in voidPtr annotation);
    void enableCapability(in string capability, inout voidPtr annotation);
    void revertCapability(in string capability, inout voidPtr annotation);
    void disableCapability(in string capability, inout voidPtr annotation);

    /**
     * The codebase URI to which this principal pertains.  This is
     * generally the document URI.
     */
    readonly attribute nsIURI URI;

    /**
     * The domain URI to which this principal pertains.
     * This is congruent with HTMLDocument.domain, and may be null.
     * Setting this has no effect on the URI.
     */
    attribute nsIURI domain;

    /**
     * The origin of this principal's domain, if non-null, or its
     * codebase URI otherwise. An origin is defined as:
     * scheme + host + port.
     */
    // XXXcaa this should probably be turned into an nsIURI.
    // The system principal's origin should be some caps namespace
    // with a chrome URI.  All of chrome should probably be the same.
    readonly attribute string origin;

    /**
     * Whether this principal is associated with a certificate.
     */
    readonly attribute boolean hasCertificate;

    /**
     * The fingerprint ID of this principal's certificate.
     * Throws if there is no certificate associated with this principal.
     */
    // XXXcaa kaie says this may not be unique.  We should probably
    // consider using something else for this....
    readonly attribute AUTF8String fingerprint;

    /**
     * The pretty name for the certificate.  This sort of (but not really)
     * identifies the subject of the certificate (the entity that stands behind
     * the certificate).  Note that this may be empty; prefer to get the
     * certificate itself and get this information from it, since that may
     * provide more information.
     *
     * Throws if there is no certificate associated with this principal.
     */
    readonly attribute AUTF8String prettyName;

    /**
     * Returns whether the other principal is equal to or weaker than this
     * principal.  Principals are equal if they are the same object, they
     * have the same origin, or they have the same certificate ID.
     *
     * Thus a principal subsumes itself if it is equal to itself.
     *
     * The system principal subsumes itself and all other principals except
     * the non-principal.
     *
     * The non-principal is not equal to itself or any other principal, and
     * therefore does not subsume itself.
     *
     * Both codebase and certificate principals are subsumed by the system
     * principal, but no codebase or certificate principal yet subsumes any
     * other codebase or certificate principal.  This may change in a future
     * release; note that nsIPrincipal is unfrozen, not slated to be frozen.
     */
    boolean subsumes(in nsIPrincipal other);

    /**
     * The subject name for the certificate.  This actually identifies the
     * subject of the certificate.  This may well not be a string that would
     * mean much to a typical user on its own (e.g. it may have a number of
     * different names all concatenated together with some information on what
     * they mean in between).
     *
     * Throws if there is no certificate associated with this principal.
     */
    readonly attribute AUTF8String subjectName;

    /**
     * The certificate associated with this principal, if any.  If there isn't
     * one, this will return null.  Getting this attribute never throws.
     */
    readonly attribute nsISupports certificate;
};
