Troble finding URN of Item from BIM 360 using Autodesk Forge

Question

We have our files in BIM 360 container. We are trying to create the viewer app which consume the BIM360 file and display it in browser, the sample code which available in Forge site for Viewer is working fine in our local environment but we are facing issue with accessing BIM360 urn in same app (we already tried with the 3- legged authentication token too ). Could you please guide us to get the right URN for the file which are stored in BIM360 container? Please find the sample URN (we have converted to base64 while accessing in viewer app)which belongs to the DWG file in BIM360 , kindly let us know whether it is right one or not.

urn:adsk.objects:os.object:wip.dm.prod/7c21a6f0-41c9-42ae-a2b2-4b5741fa4d0c.dwg urn:adsk.objects:os.object:wip.dm.prod/9ece42b9-c71c-4a27-90bb-87775f370164.dwg

Also please find the item details response json,

{
    "jsonapi": {
        "version": "1.0"
    },
    "links": {
        "self": {
            "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/items/urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g"
        }
    },
    "data": {
        "type": "items",
        "id": "urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g",
        "attributes": {
            "displayName": "bandra ga.dwg",
            "createTime": "2021-02-16T11:06:47.0000000Z",
            "createUserId": "8DCHNK3XFCM2",
            "createUserName": "VBSL System Integrator",
            "lastModifiedTime": "2021-02-16T11:06:47.0000000Z",
            "lastModifiedUserId": "8DCHNK3XFCM2",
            "lastModifiedUserName": "VBSL System Integrator",
            "hidden": false,
            "reserved": false,
            "extension": {
                "type": "items:autodesk.bim360:File",
                "version": "1.0",
                "schema": {
                    "href": "https://developer.api.autodesk.com/schema/v1/versions/items:autodesk.bim360:File-1.0"
                },
                "data": {
                    "sourceFileName": "bandra ga.dwg"
                }
            }
        },
        "links": {
            "self": {
                "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/items/urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g"
            },
            "webView": {
                "href": "https://docs.b360.autodesk.com/projects/56fded29-645c-44b6-9498-29c0f9517fec/folders/urn%3Aadsk.wipprod%3Afs.folder%3Aco.nPlZOfdwQQiTrkXjS0FVVw/detail/viewer/items/urn%3Aadsk.wipprod%3Adm.lineage%3A1sbrvwIVRJ6J_hnfeVDA2g"
            }
        },
        "relationships": {
            "tip": {
                "data": {
                    "type": "versions",
                    "id": "urn:adsk.wipprod:fs.file:vf.1sbrvwIVRJ6J_hnfeVDA2g?version=1"
                },
                "links": {
                    "related": {
                        "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/items/urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g/tip"
                    }
                }
            },
            "versions": {
                "links": {
                    "related": {
                        "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/items/urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g/versions"
                    }
                }
            },
            "parent": {
                "data": {
                    "type": "folders",
                    "id": "urn:adsk.wipprod:fs.folder:co.nPlZOfdwQQiTrkXjS0FVVw"
                },
                "links": {
                    "related": {
                        "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/items/urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g/parent"
                    }
                }
            },
            "refs": {
                "links": {
                    "self": {
                        "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/items/urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g/relationships/refs"
                    },
                    "related": {
                        "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/items/urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g/refs"
                    }
                }
            },
            "links": {
                "links": {
                    "self": {
                        "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/items/urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g/relationships/links"
                    }
                }
            }
        }
    },
    "included": [
        {
            "type": "versions",
            "id": "urn:adsk.wipprod:fs.file:vf.1sbrvwIVRJ6J_hnfeVDA2g?version=1",
            "attributes": {
                "name": "bandra ga.dwg",
                "displayName": "bandra ga.dwg",
                "createTime": "2021-02-16T11:06:47.0000000Z",
                "createUserId": "8DCHNK3XFCM2",
                "createUserName": "VBSL System Integrator",
                "lastModifiedTime": "2021-02-16T11:08:00.0000000Z",
                "lastModifiedUserId": "8DCHNK3XFCM2",
                "lastModifiedUserName": "VBSL System Integrator",
                "versionNumber": 1,
                "storageSize": 2227450,
                "fileType": "dwg",
                "extension": {
                    "type": "versions:autodesk.bim360:File",
                    "version": "1.0",
                    "schema": {
                        "href": "https://developer.api.autodesk.com/schema/v1/versions/versions:autodesk.bim360:File-1.0"
                    },
                    "data": {
                        "processState": "PROCESSING_COMPLETE",
                        "extractionState": "SUCCESS",
                        "splittingState": "NOT_SPLIT",
                        "reviewState": "NOT_IN_REVIEW",
                        "revisionDisplayLabel": "1",
                        "sourceFileName": "bandra ga.dwg"
                    }
                }
            },
            "links": {
                "self": {
                    "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/versions/urn:adsk.wipprod:fs.file:vf.1sbrvwIVRJ6J_hnfeVDA2g%3Fversion=1"
                },
                "webView": {
                    "href": "https://docs.b360.autodesk.com/projects/56fded29-645c-44b6-9498-29c0f9517fec/folders/urn%3Aadsk.wipprod%3Afs.folder%3Aco.nPlZOfdwQQiTrkXjS0FVVw/detail/viewer/items/urn%3Aadsk.wipprod%3Afs.file%3Avf.1sbrvwIVRJ6J_hnfeVDA2g%3Fversion%3D1"
                }
            },
            "relationships": {
                "item": {
                    "data": {
                        "type": "items",
                        "id": "urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g"
                    },
                    "links": {
                        "related": {
                            "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/versions/urn:adsk.wipprod:fs.file:vf.1sbrvwIVRJ6J_hnfeVDA2g%3Fversion=1/item"
                        }
                    }
                },
                "links": {
                    "links": {
                        "self": {
                            "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/versions/urn:adsk.wipprod:fs.file:vf.1sbrvwIVRJ6J_hnfeVDA2g%3Fversion=1/relationships/links"
                        }
                    }
                },
                "refs": {
                    "links": {
                        "self": {
                            "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/versions/urn:adsk.wipprod:fs.file:vf.1sbrvwIVRJ6J_hnfeVDA2g%3Fversion=1/relationships/refs"
                        },
                        "related": {
                            "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/versions/urn:adsk.wipprod:fs.file:vf.1sbrvwIVRJ6J_hnfeVDA2g%3Fversion=1/refs"
                        }
                    }
                },
                "downloadFormats": {
                    "links": {
                        "related": {
                            "href": "https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/versions/urn:adsk.wipprod:fs.file:vf.1sbrvwIVRJ6J_hnfeVDA2g%3Fversion=1/downloadFormats"
                        }
                    }
                },
                "derivatives": {
                    "data": {
                        "type": "derivatives",
                        "id": "dXJuOmFkc2sud2lwcHJvZDpmcy5maWxlOnZmLjFzYnJ2d0lWUko2Sl9obmZlVkRBMmc_dmVyc2lvbj0x"
                    },
                    "meta": {
                        "link": {
                            "href": "https://developer.api.autodesk.com/modelderivative/v2/designdata/dXJuOmFkc2sud2lwcHJvZDpmcy5maWxlOnZmLjFzYnJ2d0lWUko2Sl9obmZlVkRBMmc_dmVyc2lvbj0x/manifest?scopes=b360project.56fded29-645c-44b6-9498-29c0f9517fec,O2tenant.5902118"
                        }
                    }
                },
                "thumbnails": {
                    "data": {
                        "type": "thumbnails",
                        "id": "dXJuOmFkc2sud2lwcHJvZDpmcy5maWxlOnZmLjFzYnJ2d0lWUko2Sl9obmZlVkRBMmc_dmVyc2lvbj0x"
                    },
                    "meta": {
                        "link": {
                            "href": "https://developer.api.autodesk.com/modelderivative/v2/designdata/dXJuOmFkc2sud2lwcHJvZDpmcy5maWxlOnZmLjFzYnJ2d0lWUko2Sl9obmZlVkRBMmc_dmVyc2lvbj0x/thumbnail?scopes=b360project.56fded29-645c-44b6-9498-29c0f9517fec,O2tenant.5902118"
                        }
                    }
                },
                "storage": {
                    "data": {
                        "type": "objects",
                        "id": "urn:adsk.objects:os.object:wip.dm.prod/9ece42b9-c71c-4a27-90bb-87775f370164.dwg"
                    },
                    "meta": {
                        "link": {
                            "href": "https://developer.api.autodesk.com/oss/v2/buckets/wip.dm.prod/objects/9ece42b9-c71c-4a27-90bb-87775f370164.dwg?scopes=b360project.56fded29-645c-44b6-9498-29c0f9517fec,O2tenant.5902118"
                        }
                    }
                }
            }
        }
    ]
}

Answer 1

To get the storage location of the an item (in your case urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g), query the data of the tip (latest version) of the item using {{FORGE_HOST}}/data/v1/projects/:project/items/:item/tip (in your case, you can simply add /tip to your .links.self.href, ie. https://developer.api.autodesk.com/data/v1/projects/b.56fded29-645c-44b6-9498-29c0f9517fec/items/urn:adsk.wipprod:dm.lineage:1sbrvwIVRJ6J_hnfeVDA2g/tip.

This will return details of the latest version of the item (docs).

There, you should find data.relationships.storage.data.id, which is the the storage urn.

Answer 2

It's here: dXJuOmFkc2sud2lwcHJvZDpmcy5maWxlOnZmLjFzYnJ2d0lWUko2Sl9obmZlVkRBMmc_dmVyc2lvbj0x

"derivatives": {
    "data": {
        "type": "derivatives",
        "id": "dXJuOmFkc2sud2lwcHJvZDpmcy5maWxlOnZmLjFzYnJ2d0lWUko2Sl9obmZlVkRBMmc_dmVyc2lvbj0x"
    },
    "meta": {
        "link": {
            "href": "https://developer.api.autodesk.com/modelderivative/v2/designdata/dXJuOmFkc2sud2lwcHJvZDpmcy5maWxlOnZmLjFzYnJ2d0lWUko2Sl9obmZlVkRBMmc_dmVyc2lvbj0x/manifest?scopes=b360project.56fded29-645c-44b6-9498-29c0f9517fec,O2tenant.5902118"
        }
    }
},