regexp {/?([0-9]+)/?([^/]*)?} [ad_conn path_info] match user mode

set base [phb::key $user]
set priv 0

if {![info exists mode] 
    || [lsearch {base web small thumb} $mode] == -1} { 
    set mode small
} 

set rel portrait_$mode

if {[db_0or1row image {
    select image_revision_id, priv_portrait from phb_portraits where relation_tag = :rel and user_key = :base
} ] } { 
    if {($priv || $priv_portrait) 
        && ![permission::permission_p -party_id [ad_conn user_id] -object_id [ad_conn package_id] -privilege admin]
    } { 
        ns_set update [ad_conn outputheaders] Cache-Control \
            "no-cache,max-age=0,must-revalidate,proxy-revalidate"
        ns_returnfile 200 image/gif "[get_server_root]/packages/photobook/lib/noimage-$mode.gif"
    } else { 
        ns_set update [ad_conn outputheaders] Cache-Control \
            "no-cache,max-age=0,must-revalidate,proxy-revalidate"
        cr_write_content -revision_id $image_revision_id 
    } 
} else { 
    ns_set update [ad_conn outputheaders] Expires \
        [ns_httptime [ns_time]]
    ns_set update [ad_conn outputheaders] Cache-Control \
        "no-cache,max-age=0,must-revalidate,proxy-revalidate"
    ns_set update [ad_conn outputheaders] Pragma \
        "no-cache"

    ns_returnfile 200 image/gif "[get_server_root]/packages/photobook/lib/noimage-$mode.gif"
}