drop_share() fails if link already created

[scottyaz]

If you call drop_share on a file that already has a link you get "Conflict (HTTP 409)". Would be nice to have this return the url instead.

    system("touch ~/Dropbox/test.csv")
    drop_create("test.csv")
    drop_share(path = "test.csv", 
               requested_visibility = "public",
               link_password = NULL, 
               expires = NULL)

## and again (on accident)
    drop_share(path = "test.csv", 
               requested_visibility = "public",
               link_password = NULL, 
               expires = NULL)

Expected Behaviour

should just return bits from drop_list_shared_links()

Actual Behaviour

Error in drop_share(path = "test.csv", requested_visibility = "public",  : 
  Conflict (HTTP 409).

What happened instead?

Account Type

Are you using Dropbox Basic, Dropbox Pro, or Dropbox for Business? Pro

Session Info

Replace the output below (inside the backticks) with output from devtools::session_info() (or sessionInfo() if you don't have devtools installed)

R version 3.6.1 (2019-07-05)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Mojave 10.14.6

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] rdrop2_0.8.1             svMisc_1.1.0             knitr_1.27               RColorBrewer_1.1-2      
 [5] lubridate_1.7.4          googlesheets4_0.2.0.9000 leaflet_2.0.2            sp_1.3-2                
 [9] sf_0.7-6                 ggiraph_0.7.0            stringr_1.4.0            markdown_1.1            
[13] DT_0.7                   shiny_1.4.0              naniar_0.5.0             readr_1.3.1             
[17] ggplot2_3.3.0            tidyr_1.0.2              dplyr_0.8.5              shinydashboard_0.7.1    
[21] redcapAPI_2.3            REDCapR_0.10.2          

loaded via a namespace (and not attached):
  [1] assertive.base_0.0-7       googledrive_1.0.0          colorspace_1.4-1           ellipsis_0.3.0            
  [5] class_7.3-15               rsconnect_0.8.16           visdat_0.5.3               rgdal_1.4-4               
  [9] rprojroot_1.3-2            fs_1.3.1                   httpcode_0.2.0             rstudioapi_0.11           
 [13] farver_2.0.3               assertive.sets_0.0-3       remotes_2.1.0              fansi_0.4.1               
 [17] xml2_1.2.2                 assertive.data.uk_0.0-2    codetools_0.2-16           pkgload_1.0.2             
 [21] assertive_0.3-5            jsonlite_1.6.1             assertive.data.us_0.0-2    packrat_0.5.0             
 [25] rgeos_0.4-3                compiler_3.6.1             httr_1.4.1                 backports_1.1.5           
 [29] assertthat_0.2.1           fastmap_1.0.1              lazyeval_0.2.2             gargle_0.4.0              
 [33] cli_2.0.2                  later_1.0.0                htmltools_0.4.0            prettyunits_1.1.1         
 [37] tools_3.6.1                gtable_0.3.0               glue_1.4.0                 geojson_0.3.2             
 [41] V8_3.0.2                   Rcpp_1.0.4                 cellranger_1.1.0           vctrs_0.2.4               
 [45] crul_0.9.0                 assertive.models_0.0-2     assertive.files_0.0-2      assertive.datetimes_0.0-2 
 [49] crosstalk_1.0.0            xfun_0.12                  ps_1.3.2                   testthat_2.3.2            
 [53] mime_0.9                   lifecycle_0.2.0            devtools_2.1.0             jqr_1.1.0                 
 [57] scales_1.1.0               hms_0.5.0                  promises_1.1.0             assertive.matrices_0.0-2  
 [61] assertive.strings_0.0-3    yaml_2.2.0                 curl_4.3                   memoise_1.1.0             
 [65] gdtools_0.2.1              stringi_1.4.6              maptools_0.9-5             desc_1.2.0                
 [69] e1071_1.7-2                checkmate_1.9.4            pkgbuild_1.0.6             chron_2.3-55              
 [73] rlang_0.4.5                pkgconfig_2.0.3            systemfonts_0.1.1          assertive.data_0.0-3      
 [77] lattice_0.20-38            purrr_0.3.3                assertive.properties_0.0-4 htmlwidgets_1.5.1         
 [81] tidyselect_0.2.5           processx_3.4.2             assertive.code_0.0-3       magrittr_1.5              
 [85] R6_2.4.1                   geojsonio_0.9.0            DBI_1.0.0                  pillar_1.4.3              
 [89] foreign_0.8-71             withr_2.1.2                assertive.numbers_0.0-2    units_0.6-3               
 [93] tibble_3.0.0               labelVector_0.1.1          crayon_1.3.4               assertive.types_0.0-3     
 [97] uuid_0.1-2                 KernSmooth_2.23-15         utf8_1.1.4                 usethis_1.5.1             
[101] grid_3.6.1                 callr_3.4.3                digest_0.6.25              classInt_0.3-3            
[105] xtable_1.8-4               httpuv_1.5.2               openssl_1.4.1              munsell_0.5.0             
[109] assertive.reflection_0.0-4 sessioninfo_1.1.1          askpass_1.1